我在我的Android应用程序中使用set as wallpaper。但是当我将图像设置为壁纸时，它会在某种程度上放大设备。当我将图像设置为壁纸时我想要。这适用于每个屏幕设备。我正在使用DisplayMetrices，但它并不完美。
代码 -
public class FullImageActivity extends Activity {
int position, width, height;
LinearLayout full;
Button btn;
Context context;
DisplayMetrics metrics;
public Integer[] mThumbId = {
R.drawable.kri1, R.drawable.kri2,
R.drawable.kri3, R.drawable.kri4,
R.drawable.kri5, R.drawable.kri6,
R.drawable.kri7, R.drawable.kri8,
R.drawable.kri9
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.full_image);
// get intent data
Intent i = getIntent();
// Selected image id
position = i.getExtras().getInt("id");
full = (LinearLayout) findViewById(R.id.full);
btn = (Button)findViewById(R.id.btn);
changeBackground();
metrics = this.getResources().getDisplayMetrics();
width = metrics.widthPixels;
height = metrics.heightPixels;
btn.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
WallpaperManager myWallpaperManager = WallpaperManager.getInstance(getApplicationContext());
try {
myWallpaperManager.suggestDesiredDimensions(width, height);
myWallpaperManager.setResource(mThumbId[position]);
} catch (IOException e) {
e.printStackTrace();
}
}});
ActivitySwipeDetector activitySwipeDetector = new ActivitySwipeDetector(this);
full.setOnTouchListener(activitySwipeDetector);
}
private void changeBackground(){
full.setBackgroundResource(mThumbId[position]);
}
public class ActivitySwipeDetector implements View.OnTouchListener {
static final String logTag = "ActivitySwipeDetector";
static final int MIN_DISTANCE = 100;
private float downX, upX;
Activity activity;
public ActivitySwipeDetector(Activity activity){
this.activity = activity;
}
public void onRightToLeftSwipe(){
Log.i(logTag, "RightToLeftSwipe!");
if(position < mThumbId.length - 1){
position++;
changeBackground();
}
}
public void onLeftToRightSwipe(){
Log.i(logTag, "LeftToRightSwipe!");
if(position > 0){
position--;
changeBackground();
}
}
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN: {
downX = event.getX();
return true;
}
case MotionEvent.ACTION_UP: {
upX = event.getX();
float deltaX = downX - upX;
// swipe horizontal?
if(Math.abs(deltaX) > MIN_DISTANCE){
// left or right
if(deltaX < 0) { this.onLeftToRightSwipe(); return true; }
if(deltaX > 0) { this.onRightToLeftSwipe(); return true; }
}
else {
Log.i(logTag, "Swipe was only " + Math.abs(deltaX) + " long, need at least " + MIN_DISTANCE);
return false; // We don't consume the event
}
return true;
}
}
return false;
}
}
}
先谢谢。
答案 0 :(得分：0)
答案 1 :(得分：0)
尝试此代码将图像设置为墙纸
public void setWallpaper(final Bitmap bitmp)
{
int screenWidth=getWallpaperDesiredMinimumWidth();
int screenHeight=getWallpaperDesiredMinimumHeight();
try {
WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
Bitmap btm = getResizedBitmap(bitmp, screenHeight, screenWidth);
wallpaperManager.setBitmap(btm);
Toast toast=Toast.makeText(this, "Done", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.TOP|Gravity.CENTER, 0, 0);
toast.show();
} catch (IOException e) {
e.printStackTrace();
}
}
和
public Bitmap getResizedBitmap(Bitmap bm, int newHeight, int newWidth) {
int width = bm.getWidth();
int height = bm.getHeight();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
/**
* create a matrix for the manipulation
*/
Matrix matrix = new Matrix();
/**
* resize the bit map
*/
matrix.postScale(scaleWidth, scaleHeight);
/**
* recreate the new Bitmap
*/
Bitmap resizedBitmap = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
return resizedBitmap;
}
编辑：
您需要使用所需的位图
调用该函数btn.setOnClickListener(new Button.OnClickListener(){
@Override
public void onClick(View arg0) {
setWallpaper(BitmapFactory.decodeResource(FullImageActivity.this.getResources(),
mThumbId[position]));
}});
答案 2 :(得分：0)
我猜你需要一个Image缩放算法来维持图像宽高比，
将您拥有的最佳图像存储在可绘制文件夹中，然后让Algorithm缩小最佳图像以适合设备的Height＆amp; Width，保持原始图像的纵横比。
Bitmap scaleDownLargeImageWithAspectRatio(Bitmap image)
{
int imaheVerticalAspectRatio,imageHorizontalAspectRatio;
float bestFitScalingFactor=0;
float percesionValue=(float) 0.2;
//getAspect Ratio of Image
int imageHeight=(int) (Math.ceil((double) image.getHeight()/100)*100);
int imageWidth=(int) (Math.ceil((double) image.getWidth()/100)*100);
int GCD=BigInteger.valueOf(imageHeight).gcd(BigInteger.valueOf(imageWidth)).intValue();
imaheVerticalAspectRatio=imageHeight/GCD;
imageHorizontalAspectRatio=imageWidth/GCD;
Log.i("scaleDownLargeImageWIthAspectRatio","Image Dimensions(W:H): "+imageWidth+":"+imageHeight);
Log.i("scaleDownLargeImageWIthAspectRatio","Image AspectRatio(W:H): "+imageHorizontalAspectRatio+":"+imaheVerticalAspectRatio);
//getContainer Dimensions
int displayWidth = getWindowManager().getDefaultDisplay().getWidth();
int displayHeight = getWindowManager().getDefaultDisplay().getHeight();
//I wanted to show the image to fit the entire device, as a best case. So my ccontainer dimensions were displayWidth & displayHeight. For your case, you will need to fetch container dimensions at run time or you can pass static values to these two parameters
int leftMargin = 0;
int rightMargin = 0;
int topMargin = 0;
int bottomMargin = 0;
int containerWidth = displayWidth - (leftMargin + rightMargin);
int containerHeight = displayHeight - (topMargin + bottomMargin);
Log.i("scaleDownLargeImageWIthAspectRatio","Container dimensions(W:H): "+containerWidth+":"+containerHeight);
//iterate to get bestFitScaleFactor per constraints
while((imageHorizontalAspectRatio*bestFitScalingFactor <= containerWidth) &&
(imaheVerticalAspectRatio*bestFitScalingFactor<= containerHeight))
{
bestFitScalingFactor+=percesionValue;
}
//return bestFit bitmap
int bestFitHeight=(int) (imaheVerticalAspectRatio*bestFitScalingFactor);
int bestFitWidth=(int) (imageHorizontalAspectRatio*bestFitScalingFactor);
Log.i("scaleDownLargeImageWIthAspectRatio","bestFitScalingFactor: "+bestFitScalingFactor);
Log.i("scaleDownLargeImageWIthAspectRatio","bestFitOutPutDimesions(W:H): "+bestFitWidth+":"+bestFitHeight);
image=Bitmap.createScaledBitmap(image, bestFitWidth,bestFitHeight, true);
//Position the bitmap centre of the container
int leftPadding=(containerWidth-image.getWidth())/2;
int topPadding=(containerHeight-image.getHeight())/2;
Bitmap backDrop=Bitmap.createBitmap(containerWidth, containerHeight, Bitmap.Config.RGB_565);
Canvas can = new Canvas(backDrop);
can.drawBitmap(image, leftPadding, topPadding, null);
return backDrop;
}
private void changeBackground()
{
Drawable inputDrawable = mThumbId[position];
Bitmap bitmap = ((BitmapDrawable)inputDrawable).getBitmap();
bitmap = scaleDownLargeImageWithAspectRatio(bitmap);
@SuppressWarnings("deprecation")
Drawable outDrawable=new BitmapDrawable(bitmap);
full.setBackground(outDrawable);
}
答案 3 :(得分：0)
试试这个 -
Bitmap bmap = BitmapFactory.decodeStream(getResources().openRawResource(mThumb[position]));
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int height = metrics.heightPixels;
int width = metrics.widthPixels;
Bitmap yourbitmap = Bitmap.createScaledBitmap(bmap, width, height, true);
WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
try {
wallpaperManager.setBitmap(yourbitmap);
} catch (IOException e) {
e.printStackTrace();
}
答案 4 :(得分：0)
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);