如何从地点选择器 activity 检索地图快照？

Question

我正在创建一个从 Google 地图中挑选地点并将地址存储在数据库中的应用程序。我还想把选择的地方的快照存储在存储中，这样我就可以用相应的快照显示数据。

当我从地图上 select 一个地方时，地点选择器 activity 显示以下对话框：

在对话框的此处，显示了地址、经纬度和快照。我知道如何获取地址和经纬度。但不知道如何存储显示的快照。

这是我的方法，可以检索除该图像以外的所有内容：

  //opening place picker activity.
protected void onActivityResult(int requestCode,
                                int resultCode, Intent data) {

    if (requestCode == PLACE_PICKER_REQUEST
            && resultCode == Activity.RESULT_OK) {

        final Place place = PlacePicker.getPlace(this, data);
        final CharSequence name = place.getName();
        final CharSequence address = place.getAddress();

        String attributions = (String) place.getAttributions();
        if (attributions == null) {
            attributions = "";
        }
        tv4.setText(place.getLatLng().toString()+"\n"+name+"\n"+address+"\n"+attributions);


    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}

我不知道如何获取图像并将其存储在外部或内部存储器中。可能吗？我必须按照 this link?

中的说明拍摄快照

编辑

我有以下 activity，它正在调用 place-picker 的 activity：

Main2Activity.java:

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
 import android.os.Environment;
import android.support.v4.app.NavUtils;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.google.android.gms.common.GooglePlayServicesNotAvailableException;
import  com.google.android.gms.common.GooglePlayServicesRepairableException;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.places.Place;
import com.google.android.gms.location.places.ui.PlacePicker;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.LatLngBounds;
import android.database.Cursor;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.maps.OnMapReadyCallback;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Date;


public class Main2Activity extends AppCompatActivity implements OnMapReadyCallback{
private static final int PLACE_PICKER_REQUEST = 1;
private TextView mName;
private TextView mAddress;
private TextView mAttributions;
private GoogleApiClient mGoogleApiClient;
public TextView tv4;
private static final LatLngBounds BOUNDS_MOUNTAIN_VIEW = new LatLngBounds(
        new LatLng(37.398160, -122.180831), new LatLng(37.430610, -121.972090));

private Toolbar toolbar;
private GoogleMap mMap;
private boolean flag = false;
DatabaseHelper myDb;
EditText newevent;
Button submit;
Button viewremainders;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);


    MapFragment mapFragment = (MapFragment) getFragmentManager() .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);



    myDb =new DatabaseHelper(this);
    newevent=(EditText)findViewById(R.id.newEvent);
    submit=(Button)findViewById(R.id.submit);
    viewremainders=(Button)findViewById(R.id.view);

    toolbar = (Toolbar)findViewById(R.id.app_bar0);
    setSupportActionBar(toolbar);

    getSupportActionBar().setHomeButtonEnabled(true);          //for back button to main activity.
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    Button pickerButton = (Button) findViewById(R.id.pickerButton);
    tv4 = (TextView)findViewById(R.id.textView4);
    pickerButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                PlacePicker.IntentBuilder intentBuilder =
                        new PlacePicker.IntentBuilder();
                intentBuilder.setLatLngBounds(BOUNDS_MOUNTAIN_VIEW);
                Intent intent = intentBuilder.build(Main2Activity.this);
                startActivityForResult(intent, PLACE_PICKER_REQUEST);


            } catch (GooglePlayServicesRepairableException
                    | GooglePlayServicesNotAvailableException e) {
                e.printStackTrace();
            }
        }
    });

    AddData();
    viewremainders();
}

@Override
public void onMapReady(GoogleMap map) {


    mMap = map;
}

//method for adding data in Database.
public void AddData(){
    submit.setOnClickListener(
            new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    boolean isInserted =myDb.insertData(newevent.getText().toString(),tv4.getText().toString());
                    if(isInserted==true)
                        Toast.makeText(Main2Activity.this,"Data Inserted",Toast.LENGTH_LONG).show();
                    else
                        Toast.makeText(Main2Activity.this,"Data not Inserted",Toast.LENGTH_LONG).show();

                }
            }
    );
}

//Method for view all data from database.
public void viewremainders(){
    viewremainders.setOnClickListener(
            new View.OnClickListener(){
                @Override
                public void onClick(View v){
                    Cursor res= myDb.getAllData();
                    if(res.getCount()==0)
                    {
                        Showmessage("Error","No remainders found");
                        return;
                    }
                    StringBuffer buffer=new StringBuffer();
                    while(res.moveToNext())
                    {
                        buffer.append("Id : " +res.getString(0)+"\n");
                        buffer.append("Event : " +res.getString(1)+"\n");
                        buffer.append("Location : " +res.getString(2)+"\n");
                    }
                    Showmessage("Data",buffer.toString());

                }



            }
    );
}

public void Showmessage(String title,String message)
{
    AlertDialog.Builder builder=new AlertDialog.Builder(this);
    builder.setCancelable(true);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.show();
}


//opening place picker activity.
protected void onActivityResult(int requestCode, int resultCode, Intent data) {


    if (requestCode == PLACE_PICKER_REQUEST
            && resultCode == Activity.RESULT_OK) {

        final Place place = PlacePicker.getPlace(this, data);
        final CharSequence name = place.getName();
        final CharSequence address = place.getAddress();



        String attributions = (String) place.getAttributions();
        if (attributions == null) {
            attributions = "";
        }
     //   tv4.setText(place.getLatLng().toString()+"\n"+name+"\n"+address+"\n"+attributions);  To get latitide and longitudes.
        tv4.setText(address+"\n"+attributions);





   /*     LatLngBounds selectedPlaceBounds = PlacePicker.getLatLngBounds(data);
        // move camera to selected bounds
        CameraUpdate camera = CameraUpdateFactory.newLatLngBounds(selectedPlaceBounds,0);
        mMap.moveCamera(camera);

        // take snapshot and implement the snapshot ready callback
        mMap.snapshot(new GoogleMap.SnapshotReadyCallback() {
            Bitmap bitmap=null;
            public void onSnapshotReady(Bitmap snapshot) {
                // handle snapshot here
                bitmap = snapshot;
                try {
                    FileOutputStream out = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/ing.png");
                    bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
                    Toast.makeText(Main2Activity.this,"dsfds",Toast.LENGTH_LONG).show();
                } catch (Exception e) {
                    Toast.makeText(Main2Activity.this,e.toString(),Toast.LENGTH_SHORT).show();
                    e.printStackTrace();
                }
            }
        });*/



    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}


private void capture(){
    try {
        // image naming and path  to include sd card  appending name you choose for file
        String mPath = Environment.getExternalStoragePublicDirectory(
                Environment.DIRECTORY_MOVIES).toString();

        // create bitmap screen capture
        View v1 = getWindow().getDecorView().getRootView();
        v1.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
        v1.setDrawingCacheEnabled(false);

        File imageFile = new File(Environment.getExternalStorageDirectory().toString()+"/"+"lllll.jpg");

        FileOutputStream outputStream = new FileOutputStream(imageFile);
        int quality = 100;
        bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
        outputStream.flush();
        outputStream.close();

        openScreenshot(imageFile);
    } catch (Throwable e) {
        // Several error may come out with file handling or OOM
        e.printStackTrace();
    }
}


private void openScreenshot(File imageFile) {
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_VIEW);
    Uri uri = Uri.fromFile(imageFile);
    intent.setDataAndType(uri, "image/*");
    startActivity(intent);
}

//Methods for toolbar


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main2, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    if(id == android.R.id.home){
        NavUtils.navigateUpFromSameTask(this);
    }

    return super.onOptionsItemSelected(item);
}
}

Answer 1

如果你想先在对话框中显示所选地点的快照，你必须将地图视图的屏幕保存为位图。

参考此代码将您的地图视图转换为位图

Bitmap screen;
View v1 = MyView.getRootView();
v1.setDrawingCacheEnabled(true);
screen= Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);

从上面的代码中您可以获得位图，您可以通过将此位图设置到图像视图中来在对话框中进一步使用它。但请记住，您必须在生成对话框之前和工作线程上执行所有操作。

Answer 2

由于可以获取经纬度坐标，因此可以使用Google地图api.

获取地图图像

这是带有示例和文档的 link：

https://developers.google.com/maps/documentation/static-maps/intro

我假设这就是对话框在后台执行的操作。

如果这不起作用，或者您想要更准确的信息，我建议使用 Wireshark 来准确监控正在发送和接收的数据。

我只是运行测试了你的地图位置，还有这个 url:

https://maps.googleapis.com/maps/api/staticmap?center=37.430610,%20-121.972090&zoom=17&size=400x400&key=[myAPIKey]

我得到了这张图片：

使用对话框中的坐标：

使用https://maps.googleapis.com/maps/api/staticmap?markers=37.414333,-122.076444&zoom=17&size=400x250&key=[myKey]

Answer 3

您可以使用 GoogleMap.SnapshotReadyCallback 接口.

这是一个关于如何使用它的代码示例：

SnapshotReadyCallback callback = new SnapshotReadyCallback() {
                    Bitmap bitmap;

                    @Override
                    public void onSnapshotReady(Bitmap snapshot) {
                        bitmap = snapshot;
                        try {
                            FileOutputStream out = new FileOutputStream("/some/where/to/save/it/thesnapshot.png");
                            bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                };

                map.snapshot(callback);

您可以在显示对话框并同时保存快照时将其添加到您的代码中。在上面的 link 中阅读更多相关信息。

希望对你有所帮助，祝你好运。

Answer 4

您可以查看精简版地图。它使用 google 地图 api 和地图视图，但将每一个都视为类似于图像而不是交互式地图。您仍然可以选择缩放级别并向地图添加标记。

像声明常规 google 地图片段一样在 xml 中声明地图但包括标签 map:liteMode="true"

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:map="http://schemas.android.com/apk/res-auto"
    android:name="com.google.android.gms.maps.MapFragment"
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    map:cameraZoom="13"
    map:mapType="normal"
    map:liteMode="true"/>

或者，如果您以编程方式创建地图，则可以使用

GoogleMapOptions options = new GoogleMapOptions().liteMode(true);

从您的 Activity 代码看来，您知道如何设置 google 地图，因此您可以修改 onActivity 结果，使其看起来像这样

protected void onActivityResult(int requestCode,
                            int resultCode, Intent data) {

if (requestCode == PLACE_PICKER_REQUEST
        && resultCode == Activity.RESULT_OK) {

    final Place place = PlacePicker.getPlace(this, data);
    final CharSequence name = place.getName();
    final CharSequence address = place.getAddress();

    String attributions = (String) place.getAttributions();
    if (attributions == null) {
        attributions = "";
    }

    tv4.setText(place.getLatLng().toString()+"\n"+name+"\n"+address+"\n"+attributions);

    // Add this line to make the lite map show the location you just chose
    // and set the zoom level (10f is arbitrary)
    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(place.getLatLng(), 10f));

} else {
    super.onActivityResult(requestCode, resultCode, data);
}
}

更多信息和引用：

如果您要查找更多信息，可以从这里开始，此页面上有很多不错的链接 https://developers.google.com/maps/documentation/android-api/lite

您还可以在此处查看 Google 精简版地图演示 Activity： https://github.com/googlemaps/android-samples/blob/master/ApiDemos/app/src/main/java/com/example/mapdemo/LiteDemoActivity.java

这里有一段很棒的视频，很好地解释了精简版地图：https://youtu.be/N0N1Xkc_1pU

Answer 5

我遇到了同样的问题。在这两种情况下，我都尝试使用 API 密钥和服务器密钥，但我遇到了与 "The Google Maps API server rejected your request... " 相同的错误。最后我注意到 "Google Static Maps API" 已从控制台禁用。我只是启用并且一切正常。

如何从地点选择器 activity 检索地图快照？

How to retrieve snapshot of map from place-picker activity?

java

android

google-maps

snapshot