Android 应用程序不断崩溃，原因是：java.lang.NullPointerException：尝试调用虚拟方法
Android App Keep Crashing Caused by: java.lang.NullPointerException: Attempt to invoke virtual method
我正在尝试创建一个可以通过面部、声音和文本检测情绪的应用程序。为此，我创建了三个指向特定活动的按钮。
我正在使用 Azure 认知服务检测人脸。
但是每当我点击第一个按钮“face”而不是打开 FaceEmotionActivity 时，我的应用程序总是崩溃。
以下是错误
roidRuntime: FATAL EXCEPTION: main
Process: com.example.epp, PID: 19422
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.epp/com.example.epp.FaceEmotionActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3511)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3650)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:151)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:111)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2213)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:238)
at android.app.ActivityThread.main(ActivityThread.java:7864)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:998)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.epp.FaceEmotionActivity.onCreate(FaceEmotionActivity.java:86)
at android.app.Activity.performCreate(Activity.java:7967)
at android.app.Activity.performCreate(Activity.java:7956)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3482)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3650)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:151)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:111)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2213)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:238)
at android.app.ActivityThread.main(ActivityThread.java:7864)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:998)
我搜索了答案，但找不到合适的答案。
我的MianActivity.java是：
package com.example.epp;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/// checking for camera permission
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, 110);
}
///3 button objects accessed by id
Button faceButton = findViewById(R.id.facebtn);
Button voiceButton = findViewById(R.id.voicebtn);
Button textButton = findViewById(R.id.textbtn);
///face accessing method
faceButton.setOnClickListener(v -> {
Intent faceIntent = new Intent(MainActivity.this, FaceEmotionActivity.class);
startActivity(faceIntent);
});
///voice accessing method
voiceButton.setOnClickListener(v -> {
Intent voiceIntent = new Intent(MainActivity.this, VoiceActivity.class);
startActivity(voiceIntent);
});
///text accessing method
textButton.setOnClickListener(v -> {
Intent textIntent = new Intent(MainActivity.this, TextActivity.class);
startActivity(textIntent);
});
}
}
XML 对于 activity_main 是
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textAlignment="center"
tools:context=".MainActivity">
<Button
android:id="@+id/facebtn"
android:layout_width="match_parent"
android:layout_height="78dp"
android:layout_alignTop="@+id/voicebtn"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_centerHorizontal="true"
android:layout_marginStart="-3dp"
android:layout_marginTop="-149dp"
android:layout_marginEnd="2dp"
android:layout_marginBottom="75dp"
android:background="#8E2121"
android:text="FACE"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/textbtn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<Button
android:id="@+id/voicebtn"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_alignTop="@+id/textbtn"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginStart="-2dp"
android:layout_marginTop="-140dp"
android:layout_marginEnd="0dp"
android:layout_marginBottom="75dp"
android:background="#8E2121"
android:text="VOICE"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/textbtn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<Button
android:id="@+id/textbtn"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="0dp"
android:layout_marginTop="348dp"
android:layout_marginBottom="149dp"
android:background="#8E2121"
android:text="TEXT"
android:textSize="30sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.494"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
</RelativeLayout>
FaceEmotionActivity.java 其中 Face 按钮 假设指向
package com.example.epp;
import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.microsoft.projectoxford.face.FaceServiceClient;
import com.microsoft.projectoxford.face.FaceServiceRestClient;
import com.microsoft.projectoxford.face.contract.Face;
import com.microsoft.projectoxford.face.contract.FaceRectangle;
import org.json.JSONObject;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Arrays;
import static android.content.ContentValues.TAG;
public class FaceEmotionActivity extends AppCompatActivity {
private final FaceServiceClient faceServiceClient = new FaceServiceRestClient("https://emotiondet.cognitiveservices.azure.com//face/v1.0/", "529b219bc4b94cfe9f97e20fa3f13b51");
JSONObject jsonObject, jsonObject1;
ImageView imageView;
Bitmap mBitmap;
boolean takePicture = false;
private ProgressDialog detectionProgressDialog;
Face[] facesDetected;
static final int REQUEST_IMAGE_CAPTURE = 1;
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0 && resultCode == RESULT_OK) {
assert data != null;
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(bitmap);
detectAndFrame(bitmap);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
detectionProgressDialog = new ProgressDialog(this);
jsonObject = new JSONObject();
jsonObject1 = new JSONObject();
imageView = findViewById(R.id.imageView);
Toast.makeText(getApplicationContext(), "Press the Detect Button to take a picture. Press Identify to identify the person.", Toast.LENGTH_LONG).show();
Button btnDetect = findViewById(R.id.faceDetectBtn);
btnDetect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
} catch (ActivityNotFoundException e) {
// display error state to the user
}
}
});
}
private void detectAndFrame(final Bitmap imageBitmap) {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
ByteArrayInputStream inputStream =
new ByteArrayInputStream(outputStream.toByteArray());
@SuppressLint("StaticFieldLeak") AsyncTask<InputStream, String, Face[]> detectTask =
new AsyncTask<InputStream, String, Face[]>() {
String exceptionMessage = "";
@SuppressLint("DefaultLocale")
@Override
protected Face[] doInBackground(InputStream... params) {
try {
publishProgress("Detecting...");
Face[] result = faceServiceClient.detect(
params[0],
true, // returnFaceId
false, // returnFaceLandmarks
// returnFaceAttributes:
new FaceServiceClient.FaceAttributeType[]{
FaceServiceClient.FaceAttributeType.Emotion,
FaceServiceClient.FaceAttributeType.Gender}
);
for (int i = 0; i < result.length; i++) {
jsonObject.put("happiness", result[i].faceAttributes.emotion.happiness);
jsonObject.put("sadness", result[i].faceAttributes.emotion.sadness);
jsonObject.put("surprise", result[i].faceAttributes.emotion.surprise);
jsonObject.put("neutral", result[i].faceAttributes.emotion.neutral);
jsonObject.put("anger", result[i].faceAttributes.emotion.anger);
jsonObject.put("contempt", result[i].faceAttributes.emotion.contempt);
jsonObject.put("disgust", result[i].faceAttributes.emotion.disgust);
jsonObject.put("fear", result[i].faceAttributes.emotion.fear);
Log.e(TAG, "doInBackground: " + jsonObject.toString());
jsonObject1.put((String.valueOf(i)), jsonObject);
}
//
runOnUiThread(() -> Toast.makeText(FaceEmotionActivity.this, "DATA" + jsonObject1.toString(), Toast.LENGTH_LONG).show());
Log.e("TAG", "doInBackground: " + " " + result.length);
publishProgress(String.format(
"Detection Finished. %d face(s) detected",
result.length));
return result;
} catch (Exception e) {
exceptionMessage = String.format(
"Detection failed: %s", e.getMessage());
return null;
}
}
@Override
protected void onPreExecute() {
detectionProgressDialog.show();
}
@Override
protected void onProgressUpdate(String... progress) {
detectionProgressDialog.setMessage(progress[0]);
}
@Override
protected void onPostExecute(Face[] result) {
detectionProgressDialog.dismiss();
facesDetected = result;
if (result == null) {
// showError("No faces detected");
}
Log.e("TAG", "onPostExecute: " + Arrays.toString(facesDetected));
ImageView imageView = findViewById(R.id.imageView);
imageView.setImageBitmap(
drawFaceRectanglesOnBitmap(imageBitmap, result));
imageBitmap.recycle();
Toast.makeText(getApplicationContext(), "Now you can identify the person by pressing the \"Identify\" Button", Toast.LENGTH_LONG).show();
takePicture = true;
}
};
detectTask.execute(inputStream);
}
private static Bitmap drawFaceRectanglesOnBitmap(
Bitmap originalBitmap, Face[] faces) {
Bitmap bitmap = originalBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.RED);
paint.setStrokeWidth(9);
if (faces != null) {
for (Face face : faces) {
FaceRectangle faceRectangle = face.faceRectangle;
canvas.drawRect(
faceRectangle.left,
faceRectangle.top,
faceRectangle.left + faceRectangle.width,
faceRectangle.top + faceRectangle.height,
paint);
}
}
return bitmap;
}
}
Xml 对于 FaceEmotionActivity.java 是 activity_face_emotion.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:id="@+id/groupButton"
android:layout_alignParentBottom="true"
android:gravity="center_vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/faceDetectBtn"
android:layout_weight="3"
android:text="Detect Face"
android:layout_width="0dp"
android:layout_height="wrap_content" />
</LinearLayout>
</RelativeLayout>
我还没有创建其他两个活动，因为现在不需要它们。
谢谢
FaceEmotionActivity 设置了错误的布局
setContentView(R.layout.activity_main);
我正在尝试创建一个可以通过面部、声音和文本检测情绪的应用程序。为此，我创建了三个指向特定活动的按钮。
我正在使用 Azure 认知服务检测人脸。
但是每当我点击第一个按钮“face”而不是打开 FaceEmotionActivity 时，我的应用程序总是崩溃。
以下是错误
roidRuntime: FATAL EXCEPTION: main
Process: com.example.epp, PID: 19422
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.epp/com.example.epp.FaceEmotionActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3511)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3650)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:151)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:111)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2213)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:238)
at android.app.ActivityThread.main(ActivityThread.java:7864)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:998)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.example.epp.FaceEmotionActivity.onCreate(FaceEmotionActivity.java:86)
at android.app.Activity.performCreate(Activity.java:7967)
at android.app.Activity.performCreate(Activity.java:7956)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1320)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3482)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3650)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:151)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:111)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2213)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:238)
at android.app.ActivityThread.main(ActivityThread.java:7864)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:998)
我搜索了答案，但找不到合适的答案。
我的MianActivity.java是：
package com.example.epp;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.provider.MediaStore;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/// checking for camera permission
if (ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, 110);
}
///3 button objects accessed by id
Button faceButton = findViewById(R.id.facebtn);
Button voiceButton = findViewById(R.id.voicebtn);
Button textButton = findViewById(R.id.textbtn);
///face accessing method
faceButton.setOnClickListener(v -> {
Intent faceIntent = new Intent(MainActivity.this, FaceEmotionActivity.class);
startActivity(faceIntent);
});
///voice accessing method
voiceButton.setOnClickListener(v -> {
Intent voiceIntent = new Intent(MainActivity.this, VoiceActivity.class);
startActivity(voiceIntent);
});
///text accessing method
textButton.setOnClickListener(v -> {
Intent textIntent = new Intent(MainActivity.this, TextActivity.class);
startActivity(textIntent);
});
}
}
XML 对于 activity_main 是
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:textAlignment="center"
tools:context=".MainActivity">
<Button
android:id="@+id/facebtn"
android:layout_width="match_parent"
android:layout_height="78dp"
android:layout_alignTop="@+id/voicebtn"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_centerHorizontal="true"
android:layout_marginStart="-3dp"
android:layout_marginTop="-149dp"
android:layout_marginEnd="2dp"
android:layout_marginBottom="75dp"
android:background="#8E2121"
android:text="FACE"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/textbtn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<Button
android:id="@+id/voicebtn"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_alignTop="@+id/textbtn"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:layout_marginStart="-2dp"
android:layout_marginTop="-140dp"
android:layout_marginEnd="0dp"
android:layout_marginBottom="75dp"
android:background="#8E2121"
android:text="VOICE"
android:textSize="30sp"
app:layout_constraintBottom_toTopOf="@+id/textbtn"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
<Button
android:id="@+id/textbtn"
android:layout_width="match_parent"
android:layout_height="75dp"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_marginStart="0dp"
android:layout_marginTop="348dp"
android:layout_marginBottom="149dp"
android:background="#8E2121"
android:text="TEXT"
android:textSize="30sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.494"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView2" />
</RelativeLayout>
FaceEmotionActivity.java 其中 Face 按钮 假设指向
package com.example.epp;
import android.annotation.SuppressLint;
import android.app.ProgressDialog;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import com.microsoft.projectoxford.face.FaceServiceClient;
import com.microsoft.projectoxford.face.FaceServiceRestClient;
import com.microsoft.projectoxford.face.contract.Face;
import com.microsoft.projectoxford.face.contract.FaceRectangle;
import org.json.JSONObject;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Arrays;
import static android.content.ContentValues.TAG;
public class FaceEmotionActivity extends AppCompatActivity {
private final FaceServiceClient faceServiceClient = new FaceServiceRestClient("https://emotiondet.cognitiveservices.azure.com//face/v1.0/", "529b219bc4b94cfe9f97e20fa3f13b51");
JSONObject jsonObject, jsonObject1;
ImageView imageView;
Bitmap mBitmap;
boolean takePicture = false;
private ProgressDialog detectionProgressDialog;
Face[] facesDetected;
static final int REQUEST_IMAGE_CAPTURE = 1;
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0 && resultCode == RESULT_OK) {
assert data != null;
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
imageView.setImageBitmap(bitmap);
detectAndFrame(bitmap);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
detectionProgressDialog = new ProgressDialog(this);
jsonObject = new JSONObject();
jsonObject1 = new JSONObject();
imageView = findViewById(R.id.imageView);
Toast.makeText(getApplicationContext(), "Press the Detect Button to take a picture. Press Identify to identify the person.", Toast.LENGTH_LONG).show();
Button btnDetect = findViewById(R.id.faceDetectBtn);
btnDetect.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
} catch (ActivityNotFoundException e) {
// display error state to the user
}
}
});
}
private void detectAndFrame(final Bitmap imageBitmap) {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
imageBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
ByteArrayInputStream inputStream =
new ByteArrayInputStream(outputStream.toByteArray());
@SuppressLint("StaticFieldLeak") AsyncTask<InputStream, String, Face[]> detectTask =
new AsyncTask<InputStream, String, Face[]>() {
String exceptionMessage = "";
@SuppressLint("DefaultLocale")
@Override
protected Face[] doInBackground(InputStream... params) {
try {
publishProgress("Detecting...");
Face[] result = faceServiceClient.detect(
params[0],
true, // returnFaceId
false, // returnFaceLandmarks
// returnFaceAttributes:
new FaceServiceClient.FaceAttributeType[]{
FaceServiceClient.FaceAttributeType.Emotion,
FaceServiceClient.FaceAttributeType.Gender}
);
for (int i = 0; i < result.length; i++) {
jsonObject.put("happiness", result[i].faceAttributes.emotion.happiness);
jsonObject.put("sadness", result[i].faceAttributes.emotion.sadness);
jsonObject.put("surprise", result[i].faceAttributes.emotion.surprise);
jsonObject.put("neutral", result[i].faceAttributes.emotion.neutral);
jsonObject.put("anger", result[i].faceAttributes.emotion.anger);
jsonObject.put("contempt", result[i].faceAttributes.emotion.contempt);
jsonObject.put("disgust", result[i].faceAttributes.emotion.disgust);
jsonObject.put("fear", result[i].faceAttributes.emotion.fear);
Log.e(TAG, "doInBackground: " + jsonObject.toString());
jsonObject1.put((String.valueOf(i)), jsonObject);
}
//
runOnUiThread(() -> Toast.makeText(FaceEmotionActivity.this, "DATA" + jsonObject1.toString(), Toast.LENGTH_LONG).show());
Log.e("TAG", "doInBackground: " + " " + result.length);
publishProgress(String.format(
"Detection Finished. %d face(s) detected",
result.length));
return result;
} catch (Exception e) {
exceptionMessage = String.format(
"Detection failed: %s", e.getMessage());
return null;
}
}
@Override
protected void onPreExecute() {
detectionProgressDialog.show();
}
@Override
protected void onProgressUpdate(String... progress) {
detectionProgressDialog.setMessage(progress[0]);
}
@Override
protected void onPostExecute(Face[] result) {
detectionProgressDialog.dismiss();
facesDetected = result;
if (result == null) {
// showError("No faces detected");
}
Log.e("TAG", "onPostExecute: " + Arrays.toString(facesDetected));
ImageView imageView = findViewById(R.id.imageView);
imageView.setImageBitmap(
drawFaceRectanglesOnBitmap(imageBitmap, result));
imageBitmap.recycle();
Toast.makeText(getApplicationContext(), "Now you can identify the person by pressing the \"Identify\" Button", Toast.LENGTH_LONG).show();
takePicture = true;
}
};
detectTask.execute(inputStream);
}
private static Bitmap drawFaceRectanglesOnBitmap(
Bitmap originalBitmap, Face[] faces) {
Bitmap bitmap = originalBitmap.copy(Bitmap.Config.ARGB_8888, true);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.RED);
paint.setStrokeWidth(9);
if (faces != null) {
for (Face face : faces) {
FaceRectangle faceRectangle = face.faceRectangle;
canvas.drawRect(
faceRectangle.left,
faceRectangle.top,
faceRectangle.left + faceRectangle.width,
faceRectangle.top + faceRectangle.height,
paint);
}
}
return bitmap;
}
}
Xml 对于 FaceEmotionActivity.java 是 activity_face_emotion.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<LinearLayout
android:id="@+id/groupButton"
android:layout_alignParentBottom="true"
android:gravity="center_vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/faceDetectBtn"
android:layout_weight="3"
android:text="Detect Face"
android:layout_width="0dp"
android:layout_height="wrap_content" />
</LinearLayout>
</RelativeLayout>
我还没有创建其他两个活动，因为现在不需要它们。
谢谢
FaceEmotionActivity 设置了错误的布局
setContentView(R.layout.activity_main);