写真のランダムなスライドショーと、クリックできる下部の小さなサムネイルがあるライブ壁紙アプリを作成しています。複数のクラスを拡張する必要がありましたが、そこが行き詰まっていると思います。助けてください。
ライブ壁紙クラス:
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.View;
import android.widget.AdapterView;
public class LiveWallpaper extends WallpaperService{
public static final String SHARED_PREFS_NAME = "livewallpapersettings";
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
}
@Override
public Engine onCreateEngine() {
// TODO Auto-generated method stub
return new TestPatternEngine();
}
class TestPatternEngine extends Engine implements
SharedPreferences.OnSharedPreferenceChangeListener
{
/*Instance variables.*/
private AdapterView parent;
private View v;
private int position;
private long id;
private Bundle savedInstanceState;
private final Handler mHandler = new Handler();
private MainActivity mMainActivity;
private boolean mVisible;
private String mMode = "random";
private String mTransition = "fade";
private float mTouchX = -1;
private float mTouchY = -1;
private SharedPreferences mPreferences;
private final Runnable mStartApp = new Runnable(){
public void run() {
mMainActivity = new MainActivity();
mMainActivity.onCreate(savedInstanceState);
}
};
TestPatternEngine() {
mPreferences = LiveWallpaper.this.getSharedPreferences(SHARED_PREFS_NAME, 0);
mPreferences.registerOnSharedPreferenceChangeListener(this);
onSharedPreferenceChanged(mPreferences,null);
}
@Override
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
// TODO Auto-generated method stub
mMode = prefs.getString("livewallpaper_mode", "random");
mTransition = prefs.getString("livewallpaper_transitions", "fade");
}
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
// TODO Auto-generated method stub
super.onCreate(surfaceHolder);
setTouchEventsEnabled(true);
}
@Override
public void onDestroy()
{
super.onDestroy();
mHandler.removeCallbacks(mStartApp);
}
@Override
public void onVisibilityChanged(boolean visible)
{
mVisible = visible;
if (visible)
{
mMainActivity.onCreate(savedInstanceState);
}
else
{
mHandler.removeCallbacks(mStartApp);
}
}
@Override
public void onTouchEvent(MotionEvent event)
{
if (event.getAction() == MotionEvent.ACTION_MOVE)
{
mTouchX = event.getX();
mTouchY = event.getY();
}
else
{
mTouchX = -1;
mTouchY = -1;
}
super.onTouchEvent(event);
}
}
}
主な活動クラス：
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
import com.example.LiveWallpaper.LiveWallpaper.TestPatternEngine;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.Gallery.LayoutParams;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.ViewSwitcher;
public class MainActivity extends Activity implements
AdapterView.OnItemSelectedListener,ViewSwitcher.ViewFactory{
private final Handler mHandler = new Handler();
private int position =0;
@Override
public void onCreate(Bundle savedInstanceState) {
int delay = 1000;
int period = 3000;
Timer timer = new Timer();
timer.schedule(new TimerTask(){
@Override
public void run() {
// TODO Auto-generated method stub
runOnUiThread(new Runnable(){
@Override
public void run() {
// TODO Auto-generated method stub
Random rand = new Random();
position = rand.nextInt(mImageIds.length);
mSwitcher.setImageResource(mImageIds[position]);
}
});
}
}, delay, period);
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
mSwitcher = (ImageSwitcher) findViewById(R.id.switcher);
mSwitcher.setFactory(this);
mSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,
android.R.anim.fade_in));
mSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,
android.R.anim.fade_out));
Gallery g = (Gallery) findViewById(R.id.gallery);
g.setAdapter(new ImageAdapter(this));
g.setOnItemSelectedListener(this);
}
public void onItemSelected(AdapterView parent, View v, int position, long id) {
mSwitcher.setImageResource(mImageIds[position]);
}
public void onNothingSelected(AdapterView parent) {
}
public View makeView() {
ImageView i = new ImageView(this);
i.setBackgroundColor(0xFF000000);
i.setScaleType(ImageView.ScaleType.FIT_CENTER);
i.setLayoutParams(new ImageSwitcher.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
return i;
}
private ImageSwitcher mSwitcher;
public class ImageAdapter extends BaseAdapter {
public ImageAdapter(Context c) {
mContext = c;
}
public int getCount() {
return mThumbIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView i = new ImageView(mContext);
i.setImageResource(mThumbIds[position]);
i.setAdjustViewBounds(true);
i.setLayoutParams(new Gallery.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
i.setBackgroundResource(R.drawable.ic_launcher);
return i;
}
private Context mContext;
}
private Integer[] mThumbIds = { R.drawable.image1, R.drawable.image2, R.drawable.image3, R.drawable.image4, R.drawable.image5 };
private Integer[] mImageIds = { R.drawable.image1,
R.drawable.image2, R.drawable.image3, R.drawable.image4, R.drawable.image5};
ログキャット:
06-18 13:57:49.534: W/dalvikvm(283): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
06-18 13:57:49.584: E/AndroidRuntime(283): FATAL EXCEPTION: main
06-18 13:57:49.584: E/AndroidRuntime(283): java.lang.NullPointerException
06-18 13:57:49.584: E/AndroidRuntime(283): at com.example.Livewallpaper.LiveWallpaper$TestPatternEngine.onVisibilityChanged(LiveWallpaper.java:96)
06-18 13:57:49.584: E/AndroidRuntime(283): at android.service.wallpaper.WallpaperService$Engine.reportVisibility(WallpaperService.java:637)
06-18 13:57:49.584: E/AndroidRuntime(283): at android.service.wallpaper.WallpaperService$Engine.doVisibilityChanged(WallpaperService.java :620)
06-18 13:57:49.584: E/AndroidRuntime(283): at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:835)
06-18 13:57:49.584: E/AndroidRuntime(283): at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
06-18 13:57:49.584: E/AndroidRuntime(283): at android.os.Handler.dispatchMessage(Handler.java:99)
06-18 13:57:49.584: E/AndroidRuntime(283): at android.os.Looper.loop(Looper.java:123)
06-18 13:57:49.584: E/AndroidRuntime(283): at android.app.ActivityThread.main(ActivityThread.java:4627)
06-18 13:57:49.584: E/AndroidRuntime(283): at java.lang.reflect.Method.invokeNative(Native Method)
06-18 13:57:49.584: E/AndroidRuntime(283): at java.lang.reflect.Method.invoke(Method.java:521)
06-18 13:57:49.584: E/AndroidRuntime(283): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-18 13:57:49.584: E/AndroidRuntime(283): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-18 13:57:49.584: E/AndroidRuntime(283): at dalvik.system.NativeStart.main(Native Method)