Matrix的几种操作的简单程序--摘抄

摘抄自：http://www.cnblogs.com/limingblogs/archive/2011/10/04/2199186.html

 

package com.example.matrixtest1;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

public class MatrixTest1 extends Activity {
    private EditText scaleEt;
    private EditText rotateEt;
    private EditText translateEt1;
    private EditText translateEt2;
    private ImageView imageView;
    private Matrix matrix;
    private Bitmap bitMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_matrix_test1);

        scaleEt = (EditText) findViewById(R.id.et_scale);
        rotateEt = (EditText) findViewById(R.id.et_rotate);
        translateEt1 = (EditText) findViewById(R.id.et_translateX);
        translateEt2 = (EditText) findViewById(R.id.et_translateY);
        imageView = (ImageView) findViewById(R.id.iv_matrix);
        bitMap = BitmapFactory.decodeResource(getResources(),
                R.drawable.ic_launcher);
        imageView.setImageBitmap(bitMap);
        matrix = new Matrix();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_matrix_test1, menu);
        return true;
    }

    public void scaleBitmap(View view) {
        matrix.postScale(getValues(scaleEt), getValues(scaleEt));
        imageView.setImageMatrix(matrix);
    }

    public void rotateBitmap(View view) {
        matrix.postRotate(getValues(rotateEt));
        imageView.setImageMatrix(matrix);
    }

    public void translateBitmap(View view) {
        matrix.postTranslate(getValues(translateEt1), getValues(translateEt2));
        imageView.setImageMatrix(matrix);
    }

    public void clearMatrix(View view) {
        matrix.reset();
        imageView.setImageMatrix(matrix);
    }

    private float getValues(EditText et) {
        return Float.parseFloat(et.getText().toString());
    }
}

 

xml代码：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    > 
    <LinearLayout   
        android:layout_marginTop="10dip"
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:orientation="horizontal"> 
        <EditText android:id="@+id/et_scale"
            android:layout_weight="1.0"
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:hint="缩放比例"
            android:text="0.25"/> 
        <EditText android:id="@+id/et_rotate"
            android:layout_weight="1.0"
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="30"
            android:hint="旋转角度"
            android:onClick="rotateBitmap"/> 
        <EditText android:id="@+id/et_translateX"
            android:layout_weight="1.0" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="10"
            android:hint="X偏移"/> 
        <EditText android:id="@+id/et_translateY"
            android:layout_weight="1.0" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="10"
            android:hint="y偏移"/> 
    </LinearLayout> 
      
    <LinearLayout android:layout_marginTop="10dip"
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:orientation="horizontal"> 
        <Button android:layout_weight="1.0"
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="缩放"
            android:onClick="scaleBitmap"/> 
        <Button android:layout_weight="1.0"
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="旋转"
            android:onClick="rotateBitmap"/> 
        <Button android:layout_weight="1.0" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="移动"
            android:onClick="translateBitmap"/> 
        <Button android:layout_weight="1.0" 
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:text="还原"
            android:onClick="clearMatrix"/> 
    </LinearLayout> 
      
    <ImageView android:layout_weight="1.0"
        android:id="@+id/iv_matrix"
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" 
        android:scaleType="matrix"/> 
</LinearLayout>