Android大圖片裁剪終極解決方案

時間 2019-11-15

原文原文鏈接

根據咱們的分析與總結，圖片的來源有拍照和相冊，而可採起的操做有java

使用Bitmap並返回數據
使用Uri不返回數據

前面咱們瞭解到，使用Bitmap有可能會致使圖片過大，而不能返回實際大小的圖片，我將採用大圖Uri，小圖Bitmap的數據存儲方式。spa

咱們將要使用到URI來保存拍照後的圖片：.net

1 2	`private` `static` `final` `String IMAGE_FILE_LOCATION =` `"file:///sdcard/temp.jpg"` `;//temp file` `Uri imageUri = Uri.parse(IMAGE_FILE_LOCATION);` `//The Uri to store the big bitmap`

不難知道，咱們從相冊選取圖片的Action爲Intent.ACTION_GET_CONTENT。code

根據咱們上一篇博客的分析，我準備好了兩個實例的Intent。orm

1、從相冊截大圖：blog

 
        Intent intent =  
        new 
        Intent(Intent.ACTION_GET_CONTENT,  
        null 
        ); 
       
 
        intent.setType( 
        "image/*" 
        ); 
       
 
        intent.putExtra( 
        "crop" 
        ,  
        "true" 
        ); 
       
 
        intent.putExtra( 
        "aspectX" 
        ,  
        2 
        ); 
       
 
        intent.putExtra( 
        "aspectY" 
        ,  
        1 
        ); 
       
 
        intent.putExtra( 
        "outputX" 
        ,  
        600 
        ); 
       
 
        intent.putExtra( 
        "outputY" 
        ,  
        300 
        ); 
       
 
        intent.putExtra( 
        "scale" 
        ,  
        true 
        ); 
       
 
        intent.putExtra( 
        "return-data" 
        ,  
        false 
        ); 
       
 
        intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri); 
       
 
        intent.putExtra( 
        "outputFormat" 
        , Bitmap.CompressFormat.JPEG.toString()); 
       
 
        intent.putExtra( 
        "noFaceDetection" 
        ,  
        true 
        );  
        // no face detection 
       
 
        startActivityForResult(intent, CHOOSE_BIG_PICTURE); 
       

2、從相冊截小圖圖片

 
        Intent intent =  
        new 
        Intent(Intent.ACTION_GET_CONTENT,  
        null 
        ); 
       
 
        intent.setType( 
        "image/*" 
        ); 
       
 
        intent.putExtra( 
        "crop" 
        ,  
        "true" 
        ); 
       
 
        intent.putExtra( 
        "aspectX" 
        ,  
        2 
        ); 
       
 
        intent.putExtra( 
        "aspectY" 
        ,  
        1 
        ); 
       
 
        intent.putExtra( 
        "outputX" 
        ,  
        200 
        ); 
       
 
        intent.putExtra( 
        "outputY" 
        ,  
        100 
        ); 
       
 
        intent.putExtra( 
        "scale" 
        ,  
        true 
        ); 
       
 
        intent.putExtra( 
        "return-data" 
        ,  
        true 
        ); 
       
 
        intent.putExtra( 
        "outputFormat" 
        , Bitmap.CompressFormat.JPEG.toString()); 
       
 
        intent.putExtra( 
        "noFaceDetection" 
        ,  
        true 
        );  
        // no face detection 
       
 
        startActivityForResult(intent, CHOOSE_SMALL_PICTURE); 
       

3、對應的onActivityResult能夠這樣處理返回的數據ci

 
        switch 
        (requestCode) { 
       
        case 
        CHOOSE_BIG_PICTURE: 
       
        Log.d(TAG,  
        "CHOOSE_BIG_PICTURE: data = " 
        + data); 
        //it seems to be null 
       
        if 
        (imageUri !=  
        null 
        ){ 
       
        Bitmap bitmap = decodeUriAsBitmap(imageUri); 
        //decode bitmap 
       
        imageView.setImageBitmap(bitmap); 
       
        } 
       
        break 
        ; 
       
        case 
        CHOOSE_SMALL_PICTURE: 
       
        if 
        (data !=  
        null 
        ){ 
       
        Bitmap bitmap = data.getParcelableExtra( 
        "data" 
        ); 
       
        imageView.setImageBitmap(bitmap); 
       
        } 
        else 
        { 
       
        Log.e(TAG,  
        "CHOOSE_SMALL_PICTURE: data = " 
        + data); 
       
        } 
       
        break 
        ; 
       
        default 
        : 
       
        break 
        ; 
       
        }

 
        private 
        Bitmap decodeUriAsBitmap(Uri uri){ 
       
        Bitmap bitmap =  
        null 
        ; 
       
        try 
        { 
       
        bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(uri)); 
       
        }  
        catch 
        (FileNotFoundException e) { 
       
        e.printStackTrace(); 
       
        return 
        null 
        ; 
       
        } 
       
        return 
        bitmap; 
       
        }