Android開發(fā)實(shí)現(xiàn)圖片平移、縮放、倒影及旋轉(zhuǎn)功能的方法

更新時(shí)間：2017年10月16日 09:49:15 作者：CharlinGod

這篇文章主要介紹了Android開發(fā)實(shí)現(xiàn)圖片平移、縮放、倒影及旋轉(zhuǎn)功能的方法,涉及Android針對圖片的讀取、寫入、屬性設(shè)置及矩陣運(yùn)算等相關(guān)操作技巧,需要的朋友可以參考下

本文實(shí)例講述了Android開發(fā)實(shí)現(xiàn)圖片平移、縮放、倒影及旋轉(zhuǎn)功能的方法。分享給大家供大家參考，具體如下：

解析：

1）根據(jù)原來的圖片創(chuàng)建新的圖片

Bitmap modBm = Bitmap.createBitmap(bm.getWidth()+20, bm.getHeight()+20, bm.getConfig());

2）設(shè)置到畫布

Canvas canvas = new Canvas(modBm);

3）使用矩陣進(jìn)行平移…

Matrix matrix = new Matrix();
matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);

4）把改變后圖片設(shè)置到

canvas.drawBitmap(bm, matrix, paint);
imageView2.setImageBitmap(modBm);

示例代碼：

1、平移：

public class TranslateImageActivity extends Activity {
  private ImageView imageView1;
  private ImageView imageView2;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_rotate);
    initViews();
  }
  private void initViews() {
    imageView1 = (ImageView) findViewById(R.id.imageView1);
    imageView2 = (ImageView) findViewById(R.id.imageView2);
    Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);
    imageView1.setImageBitmap(bm);
    Bitmap modBm = Bitmap.createBitmap(bm.getWidth()+20, bm.getHeight()+20, bm.getConfig());
    Canvas canvas = new Canvas(modBm);
    Paint paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setAntiAlias(true);
    Matrix matrix = new Matrix();
    //matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
    matrix.setTranslate(20, 20);
    matrix.postTranslate(20, 20);
    canvas.drawBitmap(bm, matrix, paint);
    imageView2.setImageBitmap(modBm);
  }
}

2、縮放

public class ScaleImageActivity extends BaseActivity {
  private static final int DOUBLE = 2;
  private ImageView iv1, iv2;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_scale_iamge);
    iv1 = (ImageView) findViewById(R.id.imageView1);
    iv2 = (ImageView) findViewById(R.id.imageView2);
    Bitmap b1 = BitmapFactory.decodeResource(getResources(), R.drawable.p1);
    iv1.setImageBitmap(b1);
    Bitmap b2 = Bitmap.createBitmap(b1.getWidth()*DOUBLE, b1.getHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(b2);
    Matrix matrix = new Matrix();
    matrix.setValues(new float[]{
        DOUBLE * 1.0f, 0,    0,//x
        0,       1.0f,  0,//y
        0,       0,    1.0f//z
    });
    canvas.drawBitmap(b1, matrix, new Paint());
    iv2.setImageBitmap(b2);
  }
}

3、倒影

public class ShadeImageActivity extends Activity {
  private ImageView imageView1;
  private ImageView imageView2;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_rotate);
    initViews();
  }
  private void initViews() {
    imageView1 = (ImageView) findViewById(R.id.imageView1);
    imageView2 = (ImageView) findViewById(R.id.imageView2);
    Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm3);
    imageView1.setImageBitmap(bm);
    Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
    Canvas canvas = new Canvas(modBm);
    Paint paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setAntiAlias(true);
    Matrix matrix = new Matrix();
    //matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
    //matrix.setTranslate(20, 20);
    //鏡子效果
    matrix.setScale(1, -1);
    matrix.postTranslate(0, bm.getHeight());
    canvas.drawBitmap(bm, matrix, paint);
    imageView2.setImageBitmap(modBm);
  }
}

4、旋轉(zhuǎn)

public class RotateImageActivity extends Activity {
  private ImageView imageView1;
  private ImageView imageView2;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_rotate);
    initViews();
  }
  private void initViews() {
    imageView1 = (ImageView) findViewById(R.id.imageView1);
    imageView2 = (ImageView) findViewById(R.id.imageView2);
    Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);
    imageView1.setImageBitmap(bm);
    Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());
    Canvas canvas = new Canvas(modBm);
    Paint paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setAntiAlias(true);
    Matrix matrix = new Matrix();
    matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
    canvas.drawBitmap(bm, matrix, paint);
    imageView2.setImageBitmap(modBm);
  }
}

更多關(guān)于Android相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《Android圖形與圖像處理技巧總結(jié)》、《Android開發(fā)入門與進(jìn)階教程》、《Android調(diào)試技巧與常見問題解決方法匯總》、《Android基本組件用法總結(jié)》、《Android視圖View技巧總結(jié)》、《Android布局layout技巧總結(jié)》及《Android控件用法總結(jié)》

希望本文所述對大家Android程序設(shè)計(jì)有所幫助。

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