我正在制作一个壁纸应用程序，但我有一个问题，重新启动手机后壁纸放大，所以我尝试使用bootreciever，它做了我想要它做但但它只适用于第一个图像在应用程序，每当我将任何其他图像设置为壁纸并重新启动设备时，图像将更改为第一张图像。
所以有人知道如何解决这个问题，提前谢谢，
这是我的MainActivity java：
公共类MainActivity扩展了Activity实现OnClickListener {
static int tophone;
ImageView display;
public static Integer[] tophone2 = {
R.drawable.iv1,R.drawable.iv2,R.drawable.iv3,R.drawable.iv4 };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
tophone = R.drawable.iv1;
display = (ImageView) findViewById(R.id.IView);
ImageView image1 = (ImageView) findViewById(R.id.iv1);
ImageView image2 = (ImageView) findViewById(R.id.iv2);
ImageView image3 = (ImageView) findViewById(R.id.iv3);
ImageView image4 = (ImageView) findViewById(R.id.iv4);
Button setWp = (Button) findViewById(R.id.setWp);
Picasso.with(MainActivity.this).load(R.drawable.iv1_s).into(image1);
Picasso.with(MainActivity.this).load(R.drawable.iv2_s).into(image2);
Picasso.with(MainActivity.this).load(R.drawable.iv3_s).into(image3);
Picasso.with(MainActivity.this).load(R.drawable.iv4_s).into(image4);
image1.setOnClickListener(this);
image2.setOnClickListener(this);
image3.setOnClickListener(this);
image4.setOnClickListener(this);
setWp.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.iv1:
display.setImageResource(R.drawable.iv1);
tophone = tophone2[0];
break;
case R.id.iv2:
display.setImageResource(R.drawable.iv2);
tophone = tophone2[1];
break;
case R.id.iv3:
display.setImageResource(R.drawable.iv3);
tophone = tophone2[2];
break;
case R.id.iv4:
display.setImageResource(R.drawable.iv4);
tophone = tophone2[3];
break;
case R.id.setWp:
Toast WpSet = Toast.makeText(MainActivity.this,"Wallpaper Set", Toast.LENGTH_SHORT);
SharedPreferences sharedPreferences = getSharedPreferences("wallpaperapp",0);
sharedPreferences.edit().putInt("position",0).commit();
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Bitmap tempbitMap = BitmapFactory.decodeResource(getResources(), tophone);
Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
WallpaperManager wallpaperManager = WallpaperManager.getInstance(MainActivity.this);
wallpaperManager.setWallpaperOffsetSteps(1, 1);
wallpaperManager.suggestDesiredDimensions(width, height);
try {
wallpaperManager.setBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
WpSet.show();
break;
}
}
}
这是我的BootReceiver java：
public class BootReceiver extends BroadcastReceiver {
private static final String TAG="BootReceiver";
@Override public void onReceive(Context context,Intent intent){
try{
SharedPreferences sharedPreferences = context.getSharedPreferences("wallpaperapp",0);
int position= sharedPreferences.getInt("position", 0);
DisplayMetrics metrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Bitmap tempbitMap = BitmapFactory.decodeResource(context.getResources(),MainActivity.tophone2[position]);
Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
wallpaperManager.setWallpaperOffsetSteps(1, 1);
wallpaperManager.suggestDesiredDimensions(width, height);
try {
wallpaperManager.setBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}catch(Exception e){
Log.e(TAG,e.toString());
}
}
}
New BootReciever：
public class BootReceiver extends BroadcastReceiver {
private static final String TAG="BootReceiver";
@Override public void onReceive(Context context,Intent intent){
Intent in = new Intent(context, MainActivity.class);
in.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
context.startActivity(in);
try{
SharedPreferences sharedPreferences = context.getSharedPreferences("wallpaperapp",MainActivity.tophone);
DisplayMetrics metrics = new DisplayMetrics();
WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Bitmap tempbitMap = BitmapFactory.decodeResource(context.getResources(),MainActivity.someDefault);
Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
wallpaperManager.setWallpaperOffsetSteps(1, 1);
wallpaperManager.suggestDesiredDimensions(width, height);
try {
wallpaperManager.setBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}catch(Exception e){
Log.e(TAG,e.toString());
}
}
}
答案 0 :(得分：1)
首先改变
SharedPreferences sharedPreferences = getSharedPreferences("wallpaperapp",0);
要
SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
每当您更改壁纸时，都应该在onClick方法中将新更改的壁纸的资源ID保存到共享首选项文件中：
sharedPreference.edit().putInt(KEY, v.getId()).commit();
注意* putInt方法中的KEY变量是一个常量，您必须定义它，它是您想要更改的首选项的名称，您可以为其赋予值＆＃34; wallpaperapp＆＃34;
现在，您只需在手机完成启动后检索ID即可。使用相同的KEY
int retrievedImageID = sharedPreference.getInt(KEY, someDefaultValue);
然后只需设置图像
display.setImageResource(retrievedImageID);
这是关于sharedPreferences的android官方文档 http://developer.android.com/training/basics/data-storage/shared-preferences.html
你的MainActivity看起来像是：
public class MainActivity extends Activity implements OnClickListener {
// add these variables
public static final String KEY = "wallpaperapp"
private SharedPreferences sharedPreference;
private int retrievedImageID;
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_main);
//add these lines
sharedPreference = getPreferences(MODE_PRIVATE);
changeWallpaper();
}
public void onClick(View v) {
switch(){}
// add this line below the switch statement
sharedPreference.edit().putInt(KEY, v.getId()).commit();
}
//add this method
public void changeWallpaper(){
int someDefaultValue = R.id.iv1;
retrievedImageID = sharedPreference.getInt(KEY, someDefaultValue);
display.setImageResource(retrievedImageID);
}
你的启动接收器：
public void onReceive(Context context,Intent intent){
// comment out the existing code in here
// and add the following lines
Intent in = new Intent(context, MainActivity.class);
// these flags must be set for the receiver to start the activity
in.setFlags( Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
context.startActivity(in);
}