Android开发实现图片平移、缩放、倒影及旋转功能的方法

2019-10-22 18:25:43

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本文实例讲述了Android开发实现图片平移、缩放、倒影及旋转功能的方法。分享给大家供大家参考，具体如下：

解析：

1）根据原来的图片创建新的图片

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

2）设置到画布

Canvas canvas = new Canvas(modBm);

3）使用矩阵进行平移…

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

4）把改变后图片设置到

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

示例代码：

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、缩放

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);    //镜子效果    matrix.setScale(1, -1);    matrix.postTranslate(0, bm.getHeight());    canvas.drawBitmap(bm, matrix, paint);    imageView2.setImageBitmap(modBm);  }}

4、旋转

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);  }}

希望本文所述对大家Android程序设计有所帮助。

注：相关教程知识阅读请移步到Android开发频道。

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