解决Android图片无法裁剪问题的方法 解决Android从相册中获取图片出错图片却无法裁剪问题的方法

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Environment; 
import android.provider.MediaStore; 
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 CUT_PICTURE = 1; 
 
 public static final int SHOW_PICTURE = 2; 
 
 private Button takePhoto; 
 
 private Button chooseFromAlbum; 
 
 private ImageView picture; 
 
 private Uri imageUri; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_main); 
  takePhoto = (Button) findViewById(R.id.take_photo); 
  chooseFromAlbum = (Button) findViewById(R.id.choose_from_album); 
  picture = (ImageView) findViewById(R.id.picture); 
 
  takePhoto.setOnClickListener(new OnClickListener() { 
   @Override 
   public void onClick(View v) { 
    //创建File对象，用于存储拍照后的图片 
    //将此图片存储于SD卡的根目录下 
    File outputImage = new File(Environment.getExternalStorageDirectory(), 
      "output_image.jpg"); 
    try { 
     if (outputImage.exists()) { 
      outputImage.delete(); 
     } 
     outputImage.createNewFile(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    //将File对象转换成Uri对象 
    //Uri表标识着图片的地址 
    imageUri = Uri.fromFile(outputImage); 
    //隐式调用照相机程序 
    Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); 
    //拍下的照片会被输出到output_image.jpg中去 
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); 
    //此处是使用的startActivityForResult（） 
    //因此在拍照完后悔有结果返回到onActivityResult（）中去，返回值即为TAKE_PHOTO 
    //onActivityResult（）中主要是实现图片裁剪 
    startActivityForResult(intent, CUT_PICTURE); 
   } 
  }); 
 
  chooseFromAlbum.setOnClickListener(new OnClickListener() { 
   @Override 
   public void onClick(View v) { 
    File outputImage = new File(Environment.getExternalStorageDirectory(), 
      "output_image.jpg"); 
    imageUri = Uri.fromFile(outputImage); 
 
    try { 
     if (outputImage.exists()) { 
      outputImage.delete(); 
     } 
     outputImage.createNewFile(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 
    Intent intent = new Intent(Intent.ACTION_PICK,null); 
    //此处调用了图片选择器 
    //如果直接写intent.setDataAndType("image/*"); 
    //调用的是系统图库 
    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*"); 
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); 
    startActivityForResult(intent, CUT_PICTURE); 
   } 
  }); 
 } 
 
 
 @Override 
 protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
  switch (requestCode) { 
  case CUT_PICTURE: 
   if (resultCode == RESULT_OK) { 
    //此处启动裁剪程序 
    Intent intent = new Intent("com.android.camera.action.CROP"); 
    //此处注释掉的部分是针对android 4.4路径修改的一个测试 
    //有兴趣的读者可以自己调试看看 
    String text=imageUri.toString(); 
    Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show(); 
    intent.setDataAndType(data.getData(), "image/*"); 
    intent.putExtra("scale", true); 
    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); 
    startActivityForResult(intent, SHOW_PICTURE); 
   } 
   break; 
  case SHOW_PICTURE: 
   if (resultCode == RESULT_OK) { 
    try { 
     //将output_image.jpg对象解析成Bitmap对象，然后设置到ImageView中显示出来 
     Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver() 
       .openInputStream(imageUri)); 
     picture.setImageBitmap(bitmap); 
    } catch (FileNotFoundException e) { 
     e.printStackTrace(); 
    } 
   } 
   break; 
  default: 
   break; 
  } 
 } 
 
 
 
}