Android - Cheat Sheet

Hier gibt es nur Code Schnipsel zum Kopieren ohne Erklärung

Neue Activity

MyNameActivity.java // Class
activity_my_name.xml // Layout File
AndroidManifest.xml
strings.xml

Activity Class

package de.webmynet.android.myappname;

import android.app.Activity;
import android.os.Bundle;

public class MyNameActivity extends Activity{

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

Buttons verdrahten

import android.widget.Button;
public class MyNameActivity extends Activity implements OnClickListener {
	Button b1,b2;
...
		b1 = (Button)findViewById(R.id.b1); 
		b2 = (Button)findViewById(R.id.b2); 
		b1.setOnClickListener(this); 
		b2.setOnClickListener(this);
...
	@Override
	public void onClick(View v) {
		int id = v.getId();
		Intent i = null;
		switch (id){
		case R.id.b1:
			i = new Intent(this,OtherNameActivity.class);
			break;
		case R.id.b2:
			i = new Intent("de.webmynet.appname.OTHERNAME");//Variant with Manifest Activity Name
			break;

		default:
			break;
		}
		startActivity(i);
	}

Map View

Map Fragment zur Activity hinzufügen

Im Layout File

<fragment
  android:id="@+id/map"
  android:name="com.google.android.gms.maps.MapFragment"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />

oder direkt in der Activity

mMapFragment = MapFragment.newInstance();
 FragmentTransaction fragmentTransaction =
         getFragmentManager().beginTransaction();
 fragmentTransaction.add(R.id.my_container, mMapFragment);
 fragmentTransaction.commit();

Handle für die Karte

private GoogleMap mMap;
...
mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();

Verfügbarkeit testen

In onResume (evtl. auch onCreate) Testen ob die Karte verfügbar ist.

private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                            .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            // The Map is verified. It is now safe to manipulate the map.

        }
    }
}