Android获取手机相册图片

1. 在AndroidManifest.XML中添加权限

2. 使用Intent

在Activity Action里面有一个“ACTION_GET_CONTENT”字符串常量，该常量让用户选择特定类型的数据，并返回该数据的URI.我们利用该常量，

然后设置类型为“image/*”，就可获得android手机内的所有image。

Intent intent1 = new Intent();
intent1.setAction(Intent.ACTION_GET_CONTENT);
intent1.addCategory(Intent.CATEGORY_OPENABLE);
intent1.setType("image/*");

在onCreate中开启onActivityResult

startActivityForResult(intent1,111);

复写onActivityResult读取选择图片的uri

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
    super.onActivityResult(requestCode,resultCode,data);
    switch (requestCode){
        case 111:
            if(resultCode ==RESULT_CANCELED) {
                Toast.makeText(getApplication(), "点击取消从相册选择", Toast.LENGTH_LONG).show();
                return;
            }
            try{
                Uri uri = data.getData();
                Log.e("TAG",uri.toString());

                String filePath = getRealPathFromURI(uri);
                bitmap1 = getresizePhoto(filePath);
                imageView1.setImageBitmap(bitmap1);
                if(bitmap1!=null){
                    Log.e("aa","bitmap1不为空！！！！！！！！！！");
                }else{
                    Log.e("aa","bitmap1为空！！！！！！！！！！");
                }
            }catch (Exception e){
                e.printStackTrace();
            }
            break;
    }
}

某个uri格式：uri: content://media/external/images/media/614016

某个图片路径 /storage/emulated/0/DCIM/P70713-115542.jpg

从URI获取String类型的文件路径

public String getRealPathFromURI(Uri contentUri){
    Cursor cursor = null;
    try{

        String [] proj = {MediaStore.Images.Media.DATA};

//由context.getContentResolver()获取contentProvider再获取cursor(游

//标）用游标获取文件路径返回
        cursor = context.getContentResolver().query(contentUri,proj,null,null,null);
        cursor.moveToFirst();
        int column_indenx = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        return cursor.getString(column_indenx);
    } finally {

        if (cursor != null) {

            cursor.close();
        }
    }
}

3. 根据文件路径调整图片大小防止OOM并且返回bitmap

private Bitmap getresizePhoto(String ImagePath){
    if (ImagePath!=null){
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(ImagePath,options);
        double ratio = Math.max(options.outWidth*1.0d/1024f,options.outHeight*1.0d/1024);
        options.inSampleSize = (int) Math.ceil(ratio);
        options.inJustDecodeBounds= false;
        Bitmap bitmap=BitmapFactory.decodeFile(ImagePath,options);
        return bitmap;
    }
    return null;
}

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