android -- image (Matrix)

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縮小圖：

   @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        view = (ImageView) findViewById(R.id.imageView1);

       

        bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.butterfly);

        bmpWidth = bitmap.getWidth();

        bmpHeight = bitmap.getHeight();

        scaleOriginal = 1;

        loadImg();

}

private void loadImg(){

     Matrix matrix = new Matrix();

     scaleOriginal *= 0.5;

     matrix.postScale(scaleOriginal, scaleOriginal);

     Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);

     view.setImageBitmap(resizedBitmap);

    }

**********************************************************************

 DisplayMetrics dm = new DisplayMetrics();
     
        //取得手機解析度
        getWindowManager().getDefaultDisplay().getMetrics(dm);
     
        //設定顯示寬高
        dispalyWidth = dm.widthPixels;
        displayHeight = dm.heightPixels - 80;
     
     
        //linearLayout = (LinearLayout)findViewById(R.id.linearLayout01);
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DisplayMetrics displayMetrics = new DisplayMetrics();
((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(displayMetrics);
int statusBarHeight;
switch (displayMetrics.densityDpi) {
    case DisplayMetrics.DENSITY_HIGH:
        statusBarHeight = HIGH_DPI_STATUS_BAR_HEIGHT;
        break;
    case DisplayMetrics.DENSITY_MEDIUM:
        statusBarHeight = MEDIUM_DPI_STATUS_BAR_HEIGHT;
        break;
    case DisplayMetrics.DENSITY_LOW:
        statusBarHeight = LOW_DPI_STATUS_BAR_HEIGHT;
        break;
    default:
        statusBarHeight = MEDIUM_DPI_STATUS_BAR_HEIGHT;
}

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//縮放圖片
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);

//重新縮放 Bitmap
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bmpWidth, bmpHeight, matrix, true);