我在项目中使用地方选择器让用户添加新位置。用户单击“添加新位置”按钮后，“放置选择器”界面将打开，但问题是它只会打开1-2秒并关闭。下面是我的清单，主要活动和gradle的代码。
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.h.autoss2">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="my key" />
<activity android:name="com.example.h.autoss2.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<provider
android:name="com.example.h.autoss2.provider.PlaceContentProvider"
android:authorities="com.example.h.autoss2"
android:exported="false"/>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
MainActivity.java
public class MainActivity extends AppCompatActivity implements
ConnectionCallbacks,
OnConnectionFailedListener {
// Constants
public static final String TAG = MainActivity.class.getSimpleName();
private static final int PERMISSIONS_REQUEST_FINE_LOCATION = 111;
private static final int PLACE_PICKER_REQUEST = 1;
// Member variables
private PlaceListAdapter mAdapter;
private RecyclerView mRecyclerView;
private boolean mIsEnabled;
private GoogleApiClient mClient;
private Geofencing mGeofencing;
/**
* Called when the activity is starting
*
* @param savedInstanceState The Bundle that contains the data supplied in onSaveInstanceState
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set up the recycler view
mRecyclerView = (RecyclerView) findViewById(R.id.places_list_recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new PlaceListAdapter(this, null);
mRecyclerView.setAdapter(mAdapter);
Switch onOffSwitch = (Switch) findViewById(R.id.enable_switch);
mIsEnabled = getPreferences(MODE_PRIVATE).getBoolean(getString(R.string.setting_enabled), false);
onOffSwitch.setChecked(mIsEnabled);
onOffSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
SharedPreferences.Editor editor = getPreferences(MODE_PRIVATE).edit();
editor.putBoolean(getString(R.string.setting_enabled), isChecked);
mIsEnabled = isChecked;
editor.commit();
if (isChecked) mGeofencing.registerAllGeofences();
else mGeofencing.unRegisterAllGeofences();
}
});
mClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(Places.GEO_DATA_API)
.enableAutoManage(this, this)
.build();
mGeofencing = new Geofencing(this, mClient);
}
/***
* Called when the Google API Client is successfully connected
*
* @param connectionHint Bundle of data provided to clients by Google Play services
*/
@Override
public void onConnected(@Nullable Bundle connectionHint) {
refreshPlacesData();
Log.i(TAG, "API Client Connection Successful!");
}
/***
* Called when the Google API Client is suspended
*
* @param cause cause The reason for the disconnection. Defined by constants CAUSE_*.
*/
@Override
public void onConnectionSuspended(int cause) {
Log.i(TAG, "API Client Connection Suspended!");
}
/***
* Called when the Google API Client failed to connect to Google Play Services
*
* @param result A ConnectionResult that can be used for resolving the error
*/
@Override
public void onConnectionFailed(@NonNull ConnectionResult result) {
Log.e(TAG, "API Client Connection Failed!");
}
public void refreshPlacesData() {
Uri uri = PlaceContract.PlaceEntry.CONTENT_URI;
Cursor data = getContentResolver().query(
uri,
null,
null,
null,
null);
if (data == null || data.getCount() == 0) return;
List<String> guids = new ArrayList<String>();
while (data.moveToNext()) {
guids.add(data.getString(data.getColumnIndex(PlaceContract.PlaceEntry.COLUMN_PLACE_ID)));
}
PendingResult<PlaceBuffer> placeResult = Places.GeoDataApi.getPlaceById(mClient,
guids.toArray(new String[guids.size()]));
placeResult.setResultCallback(new ResultCallback<PlaceBuffer>() {
@Override
public void onResult(@NonNull PlaceBuffer places) {
mAdapter.swapPlaces(places);
mGeofencing.updateGeofencesList(places);
if (mIsEnabled) mGeofencing.registerAllGeofences();
}
});
}
public void onAddPlaceButtonClicked(View view) {
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, getString(R.string.need_location_permission_message), Toast.LENGTH_LONG).show();
return;
}
try {
PlacePicker.IntentBuilder builder = new PlacePicker.IntentBuilder();
startActivityForResult(builder.build(this), PLACE_PICKER_REQUEST);
} catch (GooglePlayServicesRepairableException e) {
Log.e(TAG, String.format("GooglePlayServices Not Available [%s]", e.getMessage()));
} catch (GooglePlayServicesNotAvailableException e) {
Log.e(TAG, String.format("GooglePlayServices Not Available [%s]", e.getMessage()));
} catch (Exception e) {
Log.e(TAG, String.format("PlacePicker Exception: %s", e.getMessage()));
}
}
/***
* Called when the Place Picker Activity returns back with a selected place (or after canceling)
*
* @param requestCode The request code passed when calling startActivityForResult
* @param resultCode The result code specified by the second activity
* @param data The Intent that carries the result data.
*/
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == PLACE_PICKER_REQUEST && resultCode == RESULT_OK) {
Place place = PlacePicker.getPlace(this, data);
if (place == null) {
Log.i(TAG, "No place selected");
return;
}
String placeID = place.getId();
// Insert a new place into DB
ContentValues contentValues = new ContentValues();
contentValues.put(PlaceContract.PlaceEntry.COLUMN_PLACE_ID, placeID);
getContentResolver().insert(PlaceContract.PlaceEntry.CONTENT_URI, contentValues);
// Get live data information
refreshPlacesData();
}
}
@Override
public void onResume() {
super.onResume();
// Initialize location permissions checkbox
CheckBox locationPermissions = (CheckBox) findViewById(R.id.location_permission_checkbox);
if (ActivityCompat.checkSelfPermission(MainActivity.this,
android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
locationPermissions.setChecked(false);
} else {
locationPermissions.setChecked(true);
locationPermissions.setEnabled(false);
}
// Initialize ringer permissions checkbox
CheckBox ringerPermissions = (CheckBox) findViewById(R.id.ringer_permissions_checkbox);
NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Check if the API supports such permission change and check if permission is granted
if (android.os.Build.VERSION.SDK_INT >= 24 && !nm.isNotificationPolicyAccessGranted()) {
ringerPermissions.setChecked(false);
} else {
ringerPermissions.setChecked(true);
ringerPermissions.setEnabled(false);
}
}
public void onRingerPermissionsClicked(View view) {
Intent intent = new Intent(android.provider.Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS);
startActivity(intent);
}
public void onLocationPermissionClicked(View view) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_FINE_LOCATION);
}
}
Build.gradle（app module）
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.example.h.autoss2"
minSdkVersion 16
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'),
'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.google.android.gms:play-services:9.2.0'
compile 'com.android.support:appcompat-v7:23.4.0'
compile 'com.android.support:recyclerview-v7:23.0.0'
compile 'com.google.android.gms:play-services-places:9.2.0'
compile 'com.google.android.gms:play-services-location:9.2.0'
}