我正在制作一个项目，每隔5秒就会更换一次壁纸。我可以设置壁纸，但它通过裁剪图像来设置壁纸。我想将壁纸设置为实际尺寸，我必须对此做些什么？
BitmapFactory.decodeFile(list.get(i));
options.inJustDecodeBounds = false;
if (myBitmap != null) {
myBitmap.recycle();
myBitmap = null;
}
Bitmap decodedSampleBitmap = BitmapFactory.decodeFile(list
.get(i));
// here height and width are the height and width of the display screen
myBitmap = Bitmap.createScaledBitmap(decodedSampleBitmap,
width, height, true);
if (decodedSampleBitmap != myBitmap)
decodedSampleBitmap.recycle();
decodedSampleBitmap = null;
WallpaperManager wm = WallpaperManager
.getInstance(WallService.this);
try {
Log.i("In Service", "before set wallpaper");
wm.setBitmap(myBitmap);
Log.i("In Service", "after set wallpaper");
Thread.sleep(5000);
Log.i("In Service", "after thread");
} catch (Exception e) {
Log.e("Exception", "Cannot set image as wallpaper", e);
}
更新1：
如果我使用此代码，则壁纸正在设置图像的实际大小。 现在我遇到一个小问题，即当我再次打开应用程序并单击选择照片按钮时，照片不会显示在自定义图库中
for (int i = 0; i <= list.size(); i++) {
if (i == list.size()) {
i = 0;
}
BitmapFactory.decodeFile(list.get(i));
options.inJustDecodeBounds = false;
if (myBitmap != null) {
myBitmap.recycle();
myBitmap = null;
}
if (decodedSampleBitmap != null) {
decodedSampleBitmap.recycle();
decodedSampleBitmap = null;
}
decodedSampleBitmap = BitmapFactory.decodeFile(list
.get(i));
//myBitmap = Bitmap.createScaledBitmap(decodedSampleBitmap, width, height, true);
/*if (decodedSampleBitmap != myBitmap)
decodedSampleBitmap.recycle();
decodedSampleBitmap = null;
*/
WallpaperManager wm = WallpaperManager
.getInstance(WallService.this);
try {
Log.i("In Service", "before set wallpaper");
wm.setBitmap(decodedSampleBitmap);
Log.i("In Service", "after set wallpaper");
Thread.sleep(5000);
Log.i("In Service", "after thread");
} catch (Exception e) {
Log.e("Exception", "Cannot set image as wallpaper", e);
}
}
在活动课程中...我正在点击日志＆＃34;按钮＆＃34;但我没有得到日志＆＃34;在活动结果＆＃34;
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btnAddPhots:
Intent intent = new Intent(MainActivity.this,
CustomPhotoGalleryActivity.class);
startActivityForResult(intent, PICK_IMAGE_MULTIPLE);
Log.i("Main Activity", "button clicked");
break;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.i("Main Activity", "in on activity result");
if (resultCode == RESULT_OK) {
Log.i("Main Activity", "in if1");
if (requestCode == PICK_IMAGE_MULTIPLE) {
Log.i("Main Activity", "in if2");
imagesPathList = new ArrayList<String>();
String[] imagesPath = data.getStringExtra("data").split("\\|");
try {
Log.i("Main Activity", "in try");
lnrImages.removeAllViews();
} catch (Throwable e) {
Log.i("Main Activity", "in catch");
e.printStackTrace();
}
更新2 ..
我之前尝试过，我现在再试一次，它只是将图像的背景颜色设置为壁纸。如果我使用Update1代码它是goog但不是很棒
Public class WallService extends Service {
ArrayList<String> list;
Bitmap myBitmap;
int width, height;
Bitmap decodedSampleBitmap = null;
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
Log.i("on create", "Service Created");
}
@Override
@Deprecated
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
super.onStart(intent, startId);
list = intent.getStringArrayListExtra("Imagess");
width = intent.getExtras().getInt("Width");
height = intent.getExtras().getInt("Height");
Log.i("Width= ", "" + width);
Log.i("Height= ", "" + height);
new LongOperation().execute("");
}
private class LongOperation extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
int h = 0;
int w = 0;
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
for (int i = 0; i <= list.size(); i++) {
if (i == list.size()) {
i = 0;
}
BitmapFactory.decodeFile(list.get(i));
options.inJustDecodeBounds = false;
if (myBitmap != null) {
myBitmap.recycle();
myBitmap = null;
}
if (decodedSampleBitmap != null) {
decodedSampleBitmap.recycle();
decodedSampleBitmap = null;
}
decodedSampleBitmap = decodeSampledBitmapFromFile(list.get(i),
w, h);
// myBitmap = Bitmap.createScaledBitmap(decodedSampleBitmap,
// width, height, true);
/*
* if (decodedSampleBitmap != myBitmap)
* decodedSampleBitmap.recycle(); decodedSampleBitmap = null;
*/
WallpaperManager wm = WallpaperManager
.getInstance(WallService.this);
try {
Log.i("In Service", "before set wallpaper");
wm.setBitmap(decodedSampleBitmap);
Log.i("In Service", "after set wallpaper");
Thread.sleep(5000);
Log.i("In Service", "after thread");
} catch (Exception e) {
Log.e("Exception", "Cannot set image as wallpaper", e);
}
}
return "Executed";
}
public Bitmap decodeSampledBitmapFromFile(String path, int width,
int height) {
// TODO Auto-generated method stub
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(path, options);
// String imageType = options.outMimeType;
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, width, height);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(path, options);
}
@Override
protected void onPostExecute(String result) {
}
@Override
protected void onPreExecute() {
}
@Override
protected void onProgressUpdate(Void... values) {
}
}
public int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// TODO Auto-generated method stub
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
// Calculate ratios of height and width to requested height and
// width
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
// Choose the smallest ratio as inSampleSize value, this will
// guarantee
// a final image with both dimensions larger than or equal to the
// requested height and width.
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
// Log.d(MainActivity.TAG, " in sample Size: " + inSampleSize);
return inSampleSize;
}
}
答案 0 :(得分：1)
前段时间我已经回答了类似的问题：How to set wallpaper permanently in android
我已经创建了一个简单的应用程序来随机更改壁纸，完整文件的代码是here也许就是你想要的（这里的两个关键功能是decodeSampledBitmapFromFile和{ {1}}：
calculateInSampleSize