问题
I am creating app to set image as wallpaper. I am using following code to fix image in every screen. The code is working fine. Image fit properly. But I have one problem if I play any game and then back to home screen or I restart my device then size of wallpaper zoom. I want to stop this. I want image size fit as it is on first time when I set wallpaper from my android app.
Here's Code-
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
face = Typeface.createFromAsset(getAssets(), "fonts/ABEAKRG.TTF");
Intent i = getIntent();
position = i.getExtras().getInt("id");
full = (LinearLayout) findViewById(R.id.full);
btn = (Button)findViewById(R.id.btn);
btn.setTypeface(face);
btn.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Bitmap tempbitMap = BitmapFactory.decodeResource(getResources(), mThumbId[position]);
Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
WallpaperManager wallpaperManager = WallpaperManager.getInstance(FullImageActivity.this);
wallpaperManager.setWallpaperOffsetSteps(1, 1);
wallpaperManager.suggestDesiredDimensions(width, height);
try {
wallpaperManager.setBitmap(bitmap);
Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}});
changeBackground();
ActivitySwipeDetector activitySwipeDetector = new ActivitySwipeDetector(this);
full.setOnTouchListener(activitySwipeDetector);
}
private void changeBackground(){
full.setBackgroundResource(mThumbId[position]);
}
Thanks in advance.
回答1:
Here is the code segment working for that
The MainActivity.java Code
The BootReceiver.java For Setting Wallpaper after boot completed..Code
And The Manifest.xml For setting Permissions..Code
Thanks
回答2:
yesterday i have done this task..getting image from either gallery or through camera and set that as wall paper. for this i did like this. First get the image from gallery or camera. second compress or rescale it properly according to your need. third save that image in sharedpreferences so that if image is deleted from gallery or phone memory even in that case also it will be as it is a wall paper. finally set the image as wall paper in onCreate Method of activity .
public class Util {
public static final String PREFERENCES_NAME = "prefs";
public static SharedPreferences getSharedPreference(Context context) {
return context.getSharedPreferences(PREFERENCES_NAME, Context.MODE_PRIVATE);
}
public static String getBackgroundImagePath(Context context) {
return getSharedPreference(context).getString("imagepath","");
}
public static void setBackgroundImagePath(Context context, String path) {
Editor edit = getSharedPreference(context).edit();
edit.putString("imagepath", path);
edit.commit();
}
}
call this setBackgroundImagePath method from activity by passing string path and context.like this //your image path
String path = "";
Util.setBackgroundImagePath(getApplicationContext(), path);
from onCreate() of activity,
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
face = Typeface.createFromAsset(getAssets(), "fonts/ABEAKRG.TTF");
Intent i = getIntent();
position = i.getExtras().getInt("id");
full = (LinearLayout) findViewById(R.id.full);
btn = (Button)findViewById(R.id.btn);
btn.setTypeface(face);
Bitmap path = StringToBitMap(Util.getBackgroundImagePath(getApplicationContext()));
if (path != null) {
full.setBackgroundDrawable(new BitmapDrawable((path)));
}else {
full.setBackgroundDrawable(R.drawable.defaultImage);
}
btn.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Bitmap tempbitMap = BitmapFactory.decodeResource(getResources(), mThumbId[position]);
Bitmap bitmap = Bitmap.createScaledBitmap(tempbitMap,width,height, true);
full.setBackgroundDrawable(new BitmapDrawable((bitmap)));
String image_path = BitMapToString(bitmap);
Util.setBackgroundImagePath(getApplicationContext(),image_path);
WallpaperManager wallpaperManager= WallpaperManager.getInstance(FullImageActivity.this);
wallpaperManager.setWallpaperOffsetSteps(1, 1);
wallpaperManager.suggestDesiredDimensions(width, height);
try {
wallpaperManager.setBitmap(bitmap);
Toast.makeText(getApplicationContext(), "Done", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
}
}});
ActivitySwipeDetector activitySwipeDetector = new ActivitySwipeDetector(this);
full.setOnTouchListener(activitySwipeDetector);
public Bitmap StringToBitMap(String encodedString){
try{
byte [] encodeByte=Base64.decode(encodedString,Base64.DEFAULT);
Bitmap bitmap=BitmapFactory.decodeByteArray(encodeByte, 0, encodeByte.length);
return bitmap;
}catch(Exception e){
e.getMessage();
return null;
}
}
public String BitMapToString(Bitmap bitmap){
ByteArrayOutputStream baos=new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG,100, baos);
byte [] b=baos.toByteArray();
String temp=Base64.encodeToString(b, Base64.DEFAULT);
return temp;
} }
here i am setting background to layout if you have queries .. ask hope this helps you
回答3:
Try this to set the image as wallpaper
try {
WallpaperManager myWallpaperManager = WallpaperManager
.getInstance(context);
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int fullWidth = size.x;
int fullHeight = size.y;
// int fullWidth = wManager.getDesiredMinimumWidth();
// int fullHeight = wManager.getDesiredMinimumHeight();
Log.d("Debug", Integer.toString(fullWidth));
Log.d("Debug", Integer.toString(fullHeight));
Bitmap bitmap = BitmapFactory.decodeStream(getResources()
.openRawResource(R.drawable.hello));
Bitmap bitmapResized = Bitmap.createScaledBitmap(bitmap, fullWidth,
fullHeight, true);
myWallpaperManager.suggestDesiredDimensions(
bitmapResized.getWidth(), bitmapResized.getHeight());
myWallpaperManager.setBitmap(bitmapResized);
} catch (IOException e) {
e.printStackTrace();
}
where the image is hello(R.drawable.hello)...
回答4:
Some time ago I started developing an app to change the wallpaper Automatically. I didn't have the problems you mention. The key code is bellow, maybe it helps you.
The only difference I think is that I pick a wallpaper randomly in getRandomFile. Maybe is more easy to you check the entire app in gitHub, Although the class who changes the wallpaper is this
private void changeWallPaper(int h, int w){
String path = getRandomFile();
Bitmap bm = decodeSampledBitmapFromFile(path, w, h);
try {
WallpaperManager mywall = WallpaperManager.getInstance(this);
Log.i(MainActivity.TAG, "Setting wallpaper to " + path);
mywall.setBitmap(bm);
} catch (IOException e) {
Log.e(MainActivity.TAG, "Cannot set image as wallpaper", e);
}
}
public static Bitmap decodeSampledBitmapFromFile(String path, int width, int height) {
// First decode with inJustDecodeBounds=true to check dimensions
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);
}
/**
*
* @param options
* @param reqWidth
* @param reqHeight
* @return int
* @see http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
*/
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
// Raw height and width of image
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;
}
来源：https://stackoverflow.com/questions/23053518/how-to-set-wallpaper-permanently-in-android