如何从地点选取器活动检索地图的快照？ [英] How to retrieve snapshot of map from place-picker activity?
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问题描述
我正在创建一个应用，从Google地图中挑选地点并将地址存储在数据库中。我还想将选取的地点的快照存储在存储器中，以便我可以显示具有相应快照的数据。
当我从地图中选择一个地方时，地点选择器活动显示以下对话框：
< a href =https://i.stack.imgur.com/WDg1T.jpg =noreferrer>
在对话框中显示地址，纬度和经度，也显示快照。我知道如何获得地址和latLng。但不知道如何存储显示的快照。
以下是我检索除该图像以外的所有内容的方法：
//打开地点选取器活动。
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（）;
字符串归属=（String）place.getAttributions（）;
if（attributions == null）{
attributions =;
}
tv4.setText（place.getLatLng（）。toString（）+\\\
+ name +\\\
+ address +\\\
+ attributions）;
} else {
super.onActivityResult（requestCode，resultCode，data）;
}
}
我不知道如何获取图片和将其存储在外部或内部存储器中。可能吗？我必须按照
解决方案
坐标，您可以通过使用谷歌地图api获得地图图像。
以下是链接示例和文档：
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]
I'm creating an app which picks places from the Google maps and stores the address in the database. I also want to store the snapshot of the picked place in the storage, so I can display the data with corresponding snapshot.
When I select a place from the map, the place-picker activity shows the following dialog:
Here in the dialog, the address, latitude and longitude and also the snapshot is shown. I know how to get address and latLng. but don't know how to store that displayed snapshot.
Here is my method which retrieves everything other than that image:
//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);
}
}
I don't know how to get the image and store it in external or internal storage. Is it possible? I've to take snapshot as explained in this link?
EDIT
I have the following activity, which is calling activity of place-picker:
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);
}
}
解决方案
Since you are able to get the long and lat coordinates, you can get the map image by using the Google maps api.
Here's the link with examples and docs:
https://developers.google.com/maps/documentation/static-maps/intro
I assume this is what the dialog is doing in the background.
If that does not work, or you want something more exact, I suggest using Wireshark to monitor exactly what data is being sent and received.
I just ran a test with your map locations, and with this url:
https://maps.googleapis.com/maps/api/staticmap?center=37.430610,%20-121.972090&zoom=17&size=400x400&key=[myAPIKey]
I got this image:
Using the coords from your dialog:
Using https://maps.googleapis.com/maps/api/staticmap?markers=37.414333,-122.076444&zoom=17&size=400x250&key=[myKey]
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