android-button与Matrix的使用

最新推荐文章于 2024-08-29 10:10:27 发布

原创最新推荐文章于 2024-08-29 10:10:27 发布 · 692 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#matrix #android #layout #button #float #下载工具

Android开发专栏收录该内容

95 篇文章

订阅专栏

这篇博客介绍了如何在Android中点击Button实现图片旋转效果，通过Matrix进行操作。读者可以下载提供的源代码进行学习。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

点击了button，是图片旋转一定的角度

老规矩。右键取得图片地址，利用下载工具下载这个显示不出来的图片。后缀改为rar即可得到源

代码项目。

package zhang.bp;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class bitmap_Matrix extends Activity {
	private Button mButton1;
	private Button mButton2;
	private TextView mTextView1;
	private ImageView mImageView1;
	private int ScaleTimes;
	private int ScaleAngle;
	
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mButton1=(Button)findViewById(R.id.button1);
        mButton2=(Button)findViewById(R.id.button2);
        mImageView1 = (ImageView)findViewById(R.id.imageView1);
        mTextView1 = (TextView) findViewById(R.id.textView1);
        ScaleTimes=1;
        ScaleAngle=1;
        
        final Bitmap mySourBmp= BitmapFactory.decodeResource(getResources(), R.drawable.icon);
        
        final int widthOrig = mySourBmp.getWidth();
        final int heightOrig=mySourBmp.getHeight();
        
        mImageView1.setImageBitmap(mySourBmp);
        
        mButton1.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				ScaleAngle--;
				if(ScaleAngle<-5){
					ScaleAngle=-5;
				}
				int newWidth = widthOrig*ScaleTimes;
				int newHeight = heightOrig*ScaleTimes;
				
				float scaleWidth = ((float)newWidth)/widthOrig;
				float scaleHeight= ((float)newHeight)/heightOrig;
				
				Matrix matrix = new Matrix();
				matrix.postScale(scaleWidth, scaleHeight);
				
				matrix.setRotate(5*ScaleAngle);
				
				Bitmap resizedBitmap = Bitmap.createBitmap(mySourBmp,0,0,widthOrig,heightOrig,matrix,true);
				
				BitmapDrawable  myNewBitmapDrawable=new BitmapDrawable(resizedBitmap);
				
				mImageView1.setImageDrawable(myNewBitmapDrawable);
				mTextView1.setText(Integer.toString(5*ScaleAngle));
				
			}
        	
        });
        mButton2.setOnClickListener(new Button.OnClickListener(){

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				ScaleAngle++;
				if(ScaleAngle<5){
					ScaleAngle=5;
				}
				int newWidth = widthOrig*ScaleTimes;
				int newHeight = heightOrig*ScaleTimes;
				
				float scaleWidth = ((float)newWidth)/widthOrig;
				float scaleHeight= ((float)newHeight)/heightOrig;
				
				Matrix matrix = new Matrix();
				matrix.postScale(scaleWidth, scaleHeight);
				
				matrix.setRotate(5*ScaleAngle);
				
				Bitmap resizedBitmap = Bitmap.createBitmap(mySourBmp,0,0,widthOrig,heightOrig,matrix,true);
				
				BitmapDrawable  myNewBitmapDrawable=new BitmapDrawable(resizedBitmap);
				
				mImageView1.setImageDrawable(myNewBitmapDrawable);
				mTextView1.setText(Integer.toString(5*ScaleAngle));
				
			}
        	
        });
    }
}

<?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"
    >
    <TextView android:text="TextView" android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    <TableLayout android:layout_width="fill_parent" android:id="@+id/tableLayout1" android:layout_height="wrap_content">
        <TableRow android:id="@+id/tableRow1" android:layout_width="wrap_content" android:layout_height="wrap_content">
            <Button android:text="Button" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
            <ImageView android:layout_height="wrap_content" android:src="@drawable/icon" android:id="@+id/imageView1" android:layout_width="wrap_content"></ImageView>
            <Button android:text="Button" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
        </TableRow>
    </TableLayout>
</LinearLayout>