Googlemaps编码截图返回黑色图像 [英] Googlemaps Coded screenshot returns black image
本文介绍了Googlemaps编码截图返回黑色图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在设置市场后，我试图抓取Googlemaps的屏幕截图，以便对图像进行分解并区分海洋。
但是我得到的返回结果是一个黑色的地图截图，它不包含这里的数据流是数据
我在manifest.xml中的API级别是15
import android.content.Intent;
导入android.graphics.Bitmap;
导入android.net.Uri;
导入android.os.Environment;
导入android.os.Handler;
导入android.support.v4.app.FragmentActivity;
导入android.os.Bundle;
导入android.view.View;
import com.google.android.gms.maps.CameraUpdateFactory;
导入com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
导入com.google.android.gms.maps.model.MarkerOptions;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Date;
公共类MapsActivity扩展FragmentActivity实现OnMapReadyCallback {
私有GoogleMap mMap;
GPSTracker gps;
@Override
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_maps）;
//获取SupportMapFragment并在地图准备好使用时得到通知。
SupportMapFragment mapFragment =（SupportMapFragment）getSupportFragmentManager（）
.findFragmentById（R.id.map）;
mapFragment.getMapAsync（this）;
}
/ **
*操作一次可用的地图。
*当地图准备好使用时，会触发此回调。
*这是我们可以添加标记或线条，添加听众或移动相机的位置。在这种情况下，
*我们只在澳大利亚悉尼附近添加一个标记。
*如果设备上未安装Google Play服务，系统会提示用户在SupportMapFragment中安装
* it。只有当用户安装了
* Google Play服务并返回到应用时，才会触发此方法。
* /
final Handler handler = new Handler（）;
@Override
public void onMapReady（GoogleMap googleMap）{
mMap = googleMap;
//在悉尼添加标记并移动相机
gps =新GPSTracker（MapsActivity.this）;
double latitude = gps.getLatitude（）;
double longitude = gps.getLongitude（）;
LatLng sydney =新纬度（纬度，经度）;
mMap.addMarker（new MarkerOptions（）。position（sydney）.title（Marker in Cyprus））;
mMap.moveCamera（CameraUpdateFactory.newLatLng（sydney））;
mMap.animateCamera（CameraUpdateFactory.zoomTo（19.0f））;
mMap.setOnMapClickListener（new GoogleMap.OnMapClickListener（）{
//这是一个可运行/处理程序组合
@Override
public void onMapClick（LatLng point）{
MarkerOptions marker = new MarkerOptions（）。position（
new LatLng（point.latitude，point.longitude））。title（New Marker）;
mMap.addMarker（marker）;
System.out.println（point.latitude +---+ point.longitude）;
}
}）;
takeScreenshot（）;
}
private void takeScreenshot（）{
Date now = new Date（）;
android.text.format.DateFormat.format（yyyy-MM-dd_hh：mm：ss，now）;
尝试{
//图像命名和路径以包含您为文件选择的sd卡附加名称
String mPath = Environment.getExternalStorageDirectory（）。toString（）+/ + now +.jpg;
//创建位图屏幕截图
查看v1 = getWindow（）。getDecorView（）。getRootView（）;
v1.setDrawingCacheEnabled（true）;
位图位图= Bitmap.createBitmap（v1.getDrawingCache（））;
v1.setDrawingCacheEnabled（false）;
文件imageFile =新文件（mPath）;
FileOutputStream outputStream = new FileOutputStream（imageFile）;
int quality = 100;
bitmap.compress（Bitmap.CompressFormat.JPEG，quality，outputStream）;
outputStream.flush（）;
outputStream.close（）;
openScreenshot（imageFile）;
} catch（Throwable e）{
//文件处理或者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）;
$ div $解析方案你可以使用 GoogleMap.snapshot 方法拍摄地图快照（ documentation ）
您需要实施 > GoogleMap.SnapshotReadyCallback 来管理拍摄的快照。 另外，根据至 the documentation ：
注意： I地图的法师不得传输到您的服务器，或以其他方式在应用程序之外使用。如果您需要将地图发送给其他应用程序或用户，请发送数据，以便他们为新用户重建地图而不是快照。
I am trying to take a screenshot of Googlemaps after I set a market so I can use image decomposition on it and differentiate land from the ocean. But the return result I get is a black screenshot of the maps it does not take the stream here is the data My API level on the manifest.xml is 15
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.View;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import java.io.File;
import java.io.FileOutputStream;
import java.util.Date;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
GPSTracker gps;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
final Handler handler = new Handler();
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
gps = new GPSTracker(MapsActivity.this);
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
LatLng sydney = new LatLng(latitude, longitude);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Cyprus"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney) );
mMap.animateCamera( CameraUpdateFactory.zoomTo( 19.0f ) );
mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {
//Here's a runnable/handler combo
@Override
public void onMapClick(LatLng point) {
MarkerOptions marker = new MarkerOptions().position(
new LatLng(point.latitude, point.longitude)).title("New Marker");
mMap.addMarker(marker);
System.out.println(point.latitude+"---"+ point.longitude);
}
});
takeScreenshot();
}
private void takeScreenshot() {
Date now = new Date();
android.text.format.DateFormat.format("yyyy-MM-dd_hh:mm:ss", now);
try {
// image naming and path to include sd card appending name you choose for file
String mPath = Environment.getExternalStorageDirectory().toString() + "/" + now + ".jpg";
// 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(mPath);
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);
}
}
解决方案
You can use the GoogleMap.snapshot method to take snapshots of the map (documentation)
You will need to implement a GoogleMap.SnapshotReadyCallback to manage the snapshot taken.
Also, take into account that, according to the documentation:
Note: Images of the map must not be transmitted to your servers, or otherwise used outside of the application. If you need to send a map to another application or user, send data that allows them to reconstruct the map for the new user instead of a snapshot.
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