android应用中图片的裁剪

最新推荐文章于 2019-06-19 23:39:00 发布

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最新推荐文章于 2019-06-19 23:39:00 发布

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文章标签： android layout exception button null string

本文链接：https://blog.youkuaiyun.com/xingfuyusheng/article/details/6723830

本文介绍了一种在Android应用中实现图片裁剪的方法，并通过一个具体示例详细讲解了如何将相册中的照片裁剪并设置为用户头像的过程。

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我们在做android应用时，经常要用到图片的裁剪，下面以把相册里的照片设置为用户头像来解释android中如何实现裁剪。

<?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">  
        <ImageView android:id="@+id/imageID"  
            android:adjustViewBounds="true" 
            android:src="@drawable/shan" 
            android:layout_width="wrap_content"  
            android:layout_height="wrap_content" />  
        <Button android:id="@+id/imageClipping" android:layout_height="50dip"  
                android:text="裁剪图片" android:layout_width="150dip"/>   
 </LinearLayout>                       

package com.test;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
public class MainActivity   extends Activity {  
public static final int PHOTOZOOM = 2; // 缩放  
public static final int PHOTORESOULT = 3;// 结果
private String fileName=Environment.getExternalStorageDirectory().getAbsolutePath()+"/temp.jpeg";
public static final String IMAGE_UNSPECIFIED = "image/*";  
ImageView imageView = null;  
Button imageClippingBtn= null;  
@Override  
public void onCreate(Bundle savedInstanceState) {  
    super.onCreate(savedInstanceState);  
    setContentView(R.layout.main);  

    imageView = (ImageView) findViewById(R.id.imageID);  
    imageClippingBtn= (Button) findViewById(R.id.imageClipping);  
    imageClippingBtn.setOnClickListener(new OnClickListener() {  
        @Override  
        public void onClick(View v) {  
        	Drawable d=imageView.getDrawable();
        	Bitmap bitmap=((BitmapDrawable)d).getBitmap();
        	saveMyBitmap(fileName, bitmap);
        	Uri uri=Uri.fromFile(new File(fileName));
        	startPhotoZoom(uri);
    
      }  
    });  
}  

@Override  
protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    // 处理结果  
    if (requestCode == PHOTORESOULT) {  
        Bundle extras = data.getExtras();  
        if (extras != null) {  
            Bitmap photo = extras.getParcelable("data");  
            ByteArrayOutputStream stream = new ByteArrayOutputStream();  
            photo.compress(Bitmap.CompressFormat.JPEG, 75, stream);// (0 - 100)压缩文件  
            imageView.setImageBitmap(photo);  
        }  

    }  

    super.onActivityResult(requestCode, resultCode, data);  
}  
//图片裁剪方法
public void startPhotoZoom(Uri uri) {  
    Intent intent = new Intent("com.android.camera.action.CROP");  
    intent.setDataAndType(uri, IMAGE_UNSPECIFIED);  
    intent.putExtra("crop", "true");  
    // aspectX aspectY 是宽高的比例  
    intent.putExtra("aspectX", 1);  
    intent.putExtra("aspectY", 1);  
    // outputX outputY 是裁剪图片宽高  
    intent.putExtra("outputX", 64);  
    intent.putExtra("outputY", 64);  
    intent.putExtra("return-data", true);  
    startActivityForResult(intent, PHOTORESOULT);  
} 
//把bitmap保存为文件
public void saveMyBitmap(String fileName,Bitmap mBitmap){
    File f =null; 
    FileOutputStream fOut = null;
    try {
    	     Log.e("MainActivity", "fileName:"+fileName);
    	     f=new File(fileName);
    	     f.createNewFile();
             fOut = new FileOutputStream(f);
             mBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
    } catch (Exception e) {
            e.printStackTrace();
    }
    try {
            fOut.flush();
    } catch (Exception e) {
            e.printStackTrace();
    }
    try {
           fOut.close();
    } catch (IOException e) {
            e.printStackTrace();
    }
}