Absicht ergibt sich zu "Leider App hat aufgehört."

Question

Ich mache gerade eine App mit Google Places, die Google Maps implementiert. Wenn ich jedoch diese Aktivität verlasse und versuche, sie von einer anderen Aktivität wieder zu öffnen, stürzt die App plötzlich ab. Jede Hilfe wäre sehr willkommen.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="places01.cutaneous.thesis.com.places01"> 

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
<uses-permission android:name="android.permission.INTERNET" /> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> 
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".MainActivity"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity android:name=".BackToThis"> 
     <intent-filter> 
      <action android:name="places01.cutaneous.thesis.com.places01.BackToThis" /> 

      <category android:name="android.intent.category.DEFAULT" /> 
     </intent-filter> 
    </activity> 
    <meta-data 
     android:name="com.google.android.gms.version" 
     android:value="@integer/google_play_services_version" /> 
    <meta-data 
     android:name="com.google.android.geo.API_KEY" 
     android:value="left blank." /> 
</application> 

MainActivity.java

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.OnConnectionFailedListener { 
private GoogleMap mMap; 
GoogleApiClient mGoogleApiClient; 
int PLACE_PICKER_REQUEST = 1; 
LatLng newPos; 
String placeName; 
SupportMapFragment mapFragment; 
Button button; 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    button = (Button)findViewById(R.id.button2); 
    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      startActivity(new Intent("places01.cutaneous.thesis.com.places01.BackToThis")); 
     } 
    }); 

    // For displaying Google Maps 
    mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 

    // For displaying Google Places 
    mGoogleApiClient = new GoogleApiClient 
      .Builder(this) 
      .addApi(Places.GEO_DATA_API) 
      .addApi(Places.PLACE_DETECTION_API) 
      .enableAutoManage(this, this) 
      .build(); 

    PlacePicker.IntentBuilder builder = new PlacePicker.IntentBuilder(); 

    try { 
     startActivityForResult(builder.build(this), PLACE_PICKER_REQUEST); 
    } catch (GooglePlayServicesRepairableException e) { 
     e.printStackTrace(); 
    } catch (GooglePlayServicesNotAvailableException e) { 
     e.printStackTrace(); 
    } 
} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    // For Google Places 
    if (requestCode == PLACE_PICKER_REQUEST) { 
     if (resultCode == RESULT_OK) { 
      Place place = PlacePicker.getPlace(this, data); 
      String toastMsg = String.format("Place: %s", place.getName()); 
      Toast.makeText(this, toastMsg, Toast.LENGTH_LONG).show(); 

      // setMap(mapFragment); 
      // getMap(); 
      newPos = place.getLatLng(); 
      placeName = String.format("%s", place.getName()); 
      mMap.addMarker(new MarkerOptions().position(newPos).title(placeName)); 
      onMapReady(mMap); 
     } 
    } 
    // super.onActivityResult(requestCode, resultCode, data); */ 
} 

@Override 
public void onMapReady(GoogleMap googleMap) { 
    // For Google Maps 
    mMap = googleMap; 
    LatLng newLatLng = newPos; 

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) 
     return; 
    mMap.setMyLocationEnabled(true); 

    if (newPos != null) { 
     Toast.makeText(this, newLatLng.toString(), Toast.LENGTH_LONG).show(); 
     mMap.moveCamera(CameraUpdateFactory.newLatLng(newPos)); 
    } 
} 

@Override 
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { 

} 

@Override 
public void onBackPressed() { 
    Intent intent = getIntent(); 
    finish(); 
    startActivity(intent); 
} 
} 

BackToThis.java

public class BackToThis extends AppCompatActivity { 
private static Button button; 
private static TextView textView; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_back_to_this); 

    textView = (TextView)findViewById(R.id.textView); 
    button = (Button)findViewById(R.id.button); 

    button.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      Intent intent = new Intent("places01.cutaneous.thesis.com.places01.MainActivity"); 
      startActivity(intent); 
     } 
    }); 
} 
} 

Answer 1

Intent intent = new Intent(CurrentClass.this, MainActivity.class); 

Mit dem obigen Code verwenden Sie die neueste Konfiguration davon. Das ältere Setup ist das, was du benutzt hast. Es sagt sogar, den obigen Code in der documentation zu verwenden.

Jetzt gibt es viele mögliche Abstürze und ohne den StackTrace zu sehen, kann ich nicht feststellen, ob es tatsächlich die Absicht ist oder ob es etwas im Code ist, das beim Laden der Zielaktivität zum Absturz führt.