为用相机拍摄的图像创建文件时获取 RuntimeException 和 NullPointerException
Getting RuntimeException and NullPointerException when creating file for image taken with the camera
我正在制作联系人议程应用程序，我需要将用相机拍摄的照片保存到设备图库中。我一直在关注本教程：https://developer.android.com/training/camera/photobasics 并查看并尝试了几个修复程序，但 none 似乎有效。
拍照后报错如下：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.agendaandroid, PID: 4456
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { }} to activity {com.example.agendaandroid/com.example.agendaandroid.NuevaPersonaActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4360)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4402)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference
at com.example.agendaandroid.NuevaPersonaActivity.onActivityResult(NuevaPersonaActivity.java:213)
at android.app.Activity.dispatchActivityResult(Activity.java:7454)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4353)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4402)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
这是我的 NuevaPersonaActivity.java:
<pre>
package com.example.agendaandroid;
import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import clases.Contacto;
import clases.Correo;
import clases.Telefono;
import controlador.BaseDeDatos;
public class NuevaPersonaActivity extends AppCompatActivity {
Contacto contacto;
private final int INTENT_GALERIA = 0;
private final int INTENT_CAMARA = 1;
private String direccionActualFoto;
private String[] permisos = {Manifest.permission.CAMERA,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nueva_persona);
}
public void btnAnadirContacto(View view) {
//TODO Controlar de manera más efectiva que el input no esté vacío
//TODO sacar foto con la cámara u obtener foto de galería cuando hagamos click en la imagen.
//
//https://developer.android.com/training/camera/photobasics?hl=ES
ImageView imgFoto = (ImageView) findViewById(R.id.imgFotoEdit);
String nombre = ((EditText) findViewById(R.id.txtNombreEdit)).getText().toString();
String notas = ((EditText) findViewById(R.id.txtNotasEdit)).getText().toString();
String telefono = ((EditText) findViewById(R.id.txtTlfEdit)).getText().toString();
String correo = ((EditText) findViewById(R.id.txtCorreoEdit)).getText().toString();
if (nombre.isEmpty() && notas.isEmpty()) {
Toast.makeText(this, "Información de contacto vacía", Toast.LENGTH_SHORT).show();
} else {
try {
contacto = new Contacto(nombre, notas);
BaseDeDatos bd = new BaseDeDatos(this);
bd.anadirContacto(contacto);
bd.anadirCorreoContacto(new Correo(contacto.getIdentificador(), correo));
bd.anadirTelefonoContacto(new Telefono(contacto.getIdentificador(), telefono));
Toast.makeText(this, "Nuevo contacto añadido", Toast.LENGTH_SHORT).show();
//Refrescamos el listView de la actividad principal.
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "Ha habido un problema", Toast.LENGTH_SHORT).show();
}
}
}
public void onClickFoto(View view) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (permisosConcedidos()) {
dialogoFoto();
} else {
pedirVariosPermisos();
}
}
}
/**
* Muestra un diálogo para elegir la fuente de la imagen de contacto: cámara o galería.
* Dentro de cada opción hace la acción correspondiente.
*/
private void dialogoFoto() {
AlertDialog.Builder builder = new AlertDialog.Builder(NuevaPersonaActivity.this);
builder.setTitle("Añadir una foto").setPositiveButton(R.string.camara, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intentFoto = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intentFoto.resolveActivity(getPackageManager()) != null) {
File foto = null;
try{
foto = createImageFile();
} catch (IOException e){
e.printStackTrace();
}
if(foto != null){
Uri uriFoto = FileProvider.getUriForFile(NuevaPersonaActivity.this, "com.example.agendaandroid.fileprovider", foto);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, uriFoto);
startActivityForResult(intentFoto, INTENT_CAMARA);
}
}
}
}).setNegativeButton(R.string.galeria, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intentGaleria = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intentGaleria, INTENT_GALERIA);
}
});
builder.show();
}
/*Este método comprueba si los permisos necesarios han sido aceptados o no por el usuario.
*Solo funciona si la api es mayor o igual a nuestra mínima (23). Devuelve false con solo un permiso denegado.
* */
@RequiresApi( api = Build.VERSION_CODES.M)
private boolean permisosConcedidos(){
for (String permiso : permisos){
if(checkSelfPermission(permiso) != PackageManager.PERMISSION_GRANTED){
return false;
}
}
return true;
}
/*
Este método crea una lista de los permisos que aún no tenemos concedidos y los vuelve a pedir..
*/
@RequiresApi( api = Build.VERSION_CODES.M)
private void pedirVariosPermisos(){
List<String> permisosNoConcedidos = new ArrayList<>();
for(String permiso : permisos){
if(checkSelfPermission(permiso) != PackageManager.PERMISSION_GRANTED){
permisosNoConcedidos.add(permiso);
}
}
requestPermissions(permisosNoConcedidos.toArray(new String[permisosNoConcedidos.size()]),101);
}
@RequiresApi( api = Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 101){
for (int i = 0; i < grantResults.length; i++){
if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
if(shouldShowRequestPermissionRationale(permissions[i])){
new AlertDialog.Builder(this)
.setMessage("Estos permisos son necesarios para establecer una foto de contacto")
.setPositiveButton("Aceptar", (dialog, which) -> pedirVariosPermisos())
.setNegativeButton("Cancelar", (dialog, which) -> dialog.dismiss())
.create()
.show();
}
return;
}
}
}
}
/**
* Cuando recibe el resultado de la actividad recoge la información y la muestra en el imageView
* @param requestCode
* @param resultCode
* @param data
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case INTENT_CAMARA:
if (requestCode == INTENT_CAMARA && resultCode == RESULT_OK) { ;
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ImageView imgFoto = (ImageView) findViewById(R.id.imgFotoEdit);
imgFoto.setImageBitmap(imageBitmap);
}
break;
case INTENT_GALERIA:
if((requestCode == INTENT_GALERIA) && (resultCode == RESULT_OK) && (data != null)){
Uri imagenSeleccionada = data.getData();
String[] ruta = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(imagenSeleccionada, ruta, null, null);
cursor.moveToFirst();
int indice = cursor.getColumnIndex(ruta[0]);
String rutaFoto = cursor.getString(indice);
cursor.close();
ImageView img = (ImageView) findViewById(R.id.imgFotoEdit);
img.setImageBitmap(BitmapFactory.decodeFile(rutaFoto));
}
break;
}
}
/**
* Crea un archivo para las fotos sacadas con la cámara.
* @return
* @throws IOException
*/
private File createImageFile() throws IOException{
String hora = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String nombre = "JPEG_" + hora + "_";
File direccionAlmacenamiento = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File imagen = File.createTempFile(nombre, ".jpg", direccionAlmacenamiento);
direccionActualFoto = imagen.getAbsolutePath();
return imagen;
}
</pre>
我的清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.agendaandroid">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera"
android:required="false" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".DetallePersona"></activity>
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.agendaandroid.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"></meta-data>
</provider>
<activity
android:name=".NuevaPersonaActivity"
android:label="@string/title_activity_nueva_persona"
android:theme="@style/AppTheme.NoActionBar" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
还有我的file_paths：
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="Android/data/com.example.agendaandroid/files/Pictures" />
</paths>
拍照效果很好，但是一旦我添加了代码来为照片创建文件，activity 在拍照后关闭并在 运行 上显示错误。
希望这些信息足够了，非常感谢。
编辑：
我决定将照片存储在应用程序的目录中以使其更简单，但事实证明我传递给 onActivityResult 的 Intent 为 null，因此无法获取额外内容。
Intent intentFoto = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intentFoto.resolveActivity(getPackageManager()) != null) {
File foto = null;
try{
foto = createImageFile();
} catch (IOException e){
e.printStackTrace();
}
if(foto != null){
Uri uriFoto = FileProvider.getUriForFile(getApplicationContext(),
"com.example.agendaandroid.fileprovider",
foto);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, uriFoto);
startActivityForResult(intentFoto, INTENT_CAMARA);
}
}
Uri uriFoto = FileProvider.getUriForFile(NuevaPersonaActivity.this, "com.example.agendaandroid.fileprovider", foto);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, uriFoto);
startActivityForResult(intentFoto, INTENT_CAMARA);
您正在使用 EXTRA_OUTPUT。您的照片应写入您提供的位置。
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
您正在使用 EXTRA_OUTPUT。不应该有任何多余的东西。您的照片应写入您在 EXTRA_OUTPUT 额外内容中提供的位置。使用您最喜欢的图像加载库（例如 Glide、Picasso）将其加载到您的 ImageView.
最后从图库或相机拍照的方法是这样的：
private void dialogoFoto() {
AlertDialog.Builder builder = new AlertDialog.Builder(NuevaPersonaActivity.this);
builder.setTitle("Añadir una foto").setPositiveButton(R.string.camara, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, INTENT_CAMARA);
}
}).setNegativeButton(R.string.galeria, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intentGaleria = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intentGaleria, INTENT_GALERIA);
}
});
builder.show();
}
onActivityResult 是这样的：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case INTENT_CAMARA:
if (requestCode == INTENT_CAMARA && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
ImageView imgFoto = (ImageView) findViewById(R.id.imgFotoEdit);
imgFoto.setImageBitmap(photo);
}
break;
case INTENT_GALERIA:
if((requestCode == INTENT_GALERIA) && (resultCode == RESULT_OK) && (data != null)){
Uri imagenSeleccionada = data.getData();
String[] ruta = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(imagenSeleccionada, ruta, null, null);
cursor.moveToFirst();
int indice = cursor.getColumnIndex(ruta[0]);
String rutaFoto = cursor.getString(indice);
cursor.close();
ImageView img = (ImageView) findViewById(R.id.imgFotoEdit);
img.setImageBitmap(BitmapFactory.decodeFile(rutaFoto));
}
break;
}
}
我正在制作联系人议程应用程序，我需要将用相机拍摄的照片保存到设备图库中。我一直在关注本教程：https://developer.android.com/training/camera/photobasics 并查看并尝试了几个修复程序，但 none 似乎有效。
拍照后报错如下：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.agendaandroid, PID: 4456
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { }} to activity {com.example.agendaandroid/com.example.agendaandroid.NuevaPersonaActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:4360)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4402)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference
at com.example.agendaandroid.NuevaPersonaActivity.onActivityResult(NuevaPersonaActivity.java:213)
at android.app.Activity.dispatchActivityResult(Activity.java:7454)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4353)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4402)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
这是我的 NuevaPersonaActivity.java:
<pre>
package com.example.agendaandroid;
import android.Manifest;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.content.FileProvider;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import clases.Contacto;
import clases.Correo;
import clases.Telefono;
import controlador.BaseDeDatos;
public class NuevaPersonaActivity extends AppCompatActivity {
Contacto contacto;
private final int INTENT_GALERIA = 0;
private final int INTENT_CAMARA = 1;
private String direccionActualFoto;
private String[] permisos = {Manifest.permission.CAMERA,
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nueva_persona);
}
public void btnAnadirContacto(View view) {
//TODO Controlar de manera más efectiva que el input no esté vacío
//TODO sacar foto con la cámara u obtener foto de galería cuando hagamos click en la imagen.
//
//https://developer.android.com/training/camera/photobasics?hl=ES
ImageView imgFoto = (ImageView) findViewById(R.id.imgFotoEdit);
String nombre = ((EditText) findViewById(R.id.txtNombreEdit)).getText().toString();
String notas = ((EditText) findViewById(R.id.txtNotasEdit)).getText().toString();
String telefono = ((EditText) findViewById(R.id.txtTlfEdit)).getText().toString();
String correo = ((EditText) findViewById(R.id.txtCorreoEdit)).getText().toString();
if (nombre.isEmpty() && notas.isEmpty()) {
Toast.makeText(this, "Información de contacto vacía", Toast.LENGTH_SHORT).show();
} else {
try {
contacto = new Contacto(nombre, notas);
BaseDeDatos bd = new BaseDeDatos(this);
bd.anadirContacto(contacto);
bd.anadirCorreoContacto(new Correo(contacto.getIdentificador(), correo));
bd.anadirTelefonoContacto(new Telefono(contacto.getIdentificador(), telefono));
Toast.makeText(this, "Nuevo contacto añadido", Toast.LENGTH_SHORT).show();
//Refrescamos el listView de la actividad principal.
Intent intent = new Intent(this, MainActivity.class);
startActivity(intent);
finish();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(this, "Ha habido un problema", Toast.LENGTH_SHORT).show();
}
}
}
public void onClickFoto(View view) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (permisosConcedidos()) {
dialogoFoto();
} else {
pedirVariosPermisos();
}
}
}
/**
* Muestra un diálogo para elegir la fuente de la imagen de contacto: cámara o galería.
* Dentro de cada opción hace la acción correspondiente.
*/
private void dialogoFoto() {
AlertDialog.Builder builder = new AlertDialog.Builder(NuevaPersonaActivity.this);
builder.setTitle("Añadir una foto").setPositiveButton(R.string.camara, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intentFoto = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intentFoto.resolveActivity(getPackageManager()) != null) {
File foto = null;
try{
foto = createImageFile();
} catch (IOException e){
e.printStackTrace();
}
if(foto != null){
Uri uriFoto = FileProvider.getUriForFile(NuevaPersonaActivity.this, "com.example.agendaandroid.fileprovider", foto);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, uriFoto);
startActivityForResult(intentFoto, INTENT_CAMARA);
}
}
}
}).setNegativeButton(R.string.galeria, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intentGaleria = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intentGaleria, INTENT_GALERIA);
}
});
builder.show();
}
/*Este método comprueba si los permisos necesarios han sido aceptados o no por el usuario.
*Solo funciona si la api es mayor o igual a nuestra mínima (23). Devuelve false con solo un permiso denegado.
* */
@RequiresApi( api = Build.VERSION_CODES.M)
private boolean permisosConcedidos(){
for (String permiso : permisos){
if(checkSelfPermission(permiso) != PackageManager.PERMISSION_GRANTED){
return false;
}
}
return true;
}
/*
Este método crea una lista de los permisos que aún no tenemos concedidos y los vuelve a pedir..
*/
@RequiresApi( api = Build.VERSION_CODES.M)
private void pedirVariosPermisos(){
List<String> permisosNoConcedidos = new ArrayList<>();
for(String permiso : permisos){
if(checkSelfPermission(permiso) != PackageManager.PERMISSION_GRANTED){
permisosNoConcedidos.add(permiso);
}
}
requestPermissions(permisosNoConcedidos.toArray(new String[permisosNoConcedidos.size()]),101);
}
@RequiresApi( api = Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 101){
for (int i = 0; i < grantResults.length; i++){
if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
if(shouldShowRequestPermissionRationale(permissions[i])){
new AlertDialog.Builder(this)
.setMessage("Estos permisos son necesarios para establecer una foto de contacto")
.setPositiveButton("Aceptar", (dialog, which) -> pedirVariosPermisos())
.setNegativeButton("Cancelar", (dialog, which) -> dialog.dismiss())
.create()
.show();
}
return;
}
}
}
}
/**
* Cuando recibe el resultado de la actividad recoge la información y la muestra en el imageView
* @param requestCode
* @param resultCode
* @param data
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case INTENT_CAMARA:
if (requestCode == INTENT_CAMARA && resultCode == RESULT_OK) { ;
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ImageView imgFoto = (ImageView) findViewById(R.id.imgFotoEdit);
imgFoto.setImageBitmap(imageBitmap);
}
break;
case INTENT_GALERIA:
if((requestCode == INTENT_GALERIA) && (resultCode == RESULT_OK) && (data != null)){
Uri imagenSeleccionada = data.getData();
String[] ruta = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(imagenSeleccionada, ruta, null, null);
cursor.moveToFirst();
int indice = cursor.getColumnIndex(ruta[0]);
String rutaFoto = cursor.getString(indice);
cursor.close();
ImageView img = (ImageView) findViewById(R.id.imgFotoEdit);
img.setImageBitmap(BitmapFactory.decodeFile(rutaFoto));
}
break;
}
}
/**
* Crea un archivo para las fotos sacadas con la cámara.
* @return
* @throws IOException
*/
private File createImageFile() throws IOException{
String hora = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String nombre = "JPEG_" + hora + "_";
File direccionAlmacenamiento = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File imagen = File.createTempFile(nombre, ".jpg", direccionAlmacenamiento);
direccionActualFoto = imagen.getAbsolutePath();
return imagen;
}
</pre>
我的清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.agendaandroid">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera"
android:required="false" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".DetallePersona"></activity>
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.agendaandroid.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"></meta-data>
</provider>
<activity
android:name=".NuevaPersonaActivity"
android:label="@string/title_activity_nueva_persona"
android:theme="@style/AppTheme.NoActionBar" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
还有我的file_paths：
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="Android/data/com.example.agendaandroid/files/Pictures" />
</paths>
拍照效果很好，但是一旦我添加了代码来为照片创建文件，activity 在拍照后关闭并在 运行 上显示错误。
希望这些信息足够了，非常感谢。
编辑： 我决定将照片存储在应用程序的目录中以使其更简单，但事实证明我传递给 onActivityResult 的 Intent 为 null，因此无法获取额外内容。
Intent intentFoto = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (intentFoto.resolveActivity(getPackageManager()) != null) {
File foto = null;
try{
foto = createImageFile();
} catch (IOException e){
e.printStackTrace();
}
if(foto != null){
Uri uriFoto = FileProvider.getUriForFile(getApplicationContext(),
"com.example.agendaandroid.fileprovider",
foto);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, uriFoto);
startActivityForResult(intentFoto, INTENT_CAMARA);
}
}
Uri uriFoto = FileProvider.getUriForFile(NuevaPersonaActivity.this, "com.example.agendaandroid.fileprovider", foto);
intentFoto.putExtra(MediaStore.EXTRA_OUTPUT, uriFoto);
startActivityForResult(intentFoto, INTENT_CAMARA);
您正在使用 EXTRA_OUTPUT。您的照片应写入您提供的位置。
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
您正在使用 EXTRA_OUTPUT。不应该有任何多余的东西。您的照片应写入您在 EXTRA_OUTPUT 额外内容中提供的位置。使用您最喜欢的图像加载库（例如 Glide、Picasso）将其加载到您的 ImageView.
最后从图库或相机拍照的方法是这样的：
private void dialogoFoto() {
AlertDialog.Builder builder = new AlertDialog.Builder(NuevaPersonaActivity.this);
builder.setTitle("Añadir una foto").setPositiveButton(R.string.camara, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, INTENT_CAMARA);
}
}).setNegativeButton(R.string.galeria, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Intent intentGaleria = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intentGaleria, INTENT_GALERIA);
}
});
builder.show();
}
onActivityResult 是这样的：
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch(requestCode){
case INTENT_CAMARA:
if (requestCode == INTENT_CAMARA && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap) data.getExtras().get("data");
ImageView imgFoto = (ImageView) findViewById(R.id.imgFotoEdit);
imgFoto.setImageBitmap(photo);
}
break;
case INTENT_GALERIA:
if((requestCode == INTENT_GALERIA) && (resultCode == RESULT_OK) && (data != null)){
Uri imagenSeleccionada = data.getData();
String[] ruta = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(imagenSeleccionada, ruta, null, null);
cursor.moveToFirst();
int indice = cursor.getColumnIndex(ruta[0]);
String rutaFoto = cursor.getString(indice);
cursor.close();
ImageView img = (ImageView) findViewById(R.id.imgFotoEdit);
img.setImageBitmap(BitmapFactory.decodeFile(rutaFoto));
}
break;
}
}