Android之相机相册服务调用

相册服务

1. 判断是否有外存
2. 通过startActivityForResult(intent, MainActivity.GALLERY_REQUET)返回主Activity获得result.
3. 重写方法 protected void onActivityResult(int requestCode, int resultCode, Intent data);

/**
     * 调用相册服务
     */
    public void takePhoto(){
         Intent intent = null;
         String state = Environment.getExternalStorageState();  
         if (state.equals(Environment.MEDIA_MOUNTED)) {  
             intent=new Intent(Intent.ACTION_GET_CONTENT);
             intent.addCategory(Intent.CATEGORY_OPENABLE);
             intent.setType("image/*");
             intent.putExtra("cameraPhoto", true);
             startActivityForResult(intent, MainActivity.GALLERY_REQUET);
             }
             else {  
                 Toast.makeText(this, "请确认已经插入SD卡", Toast.LENGTH_LONG).show();  
             }  
             Log.i("Target", "选取照片");
    }

相机服务

这里给出的就是拍照并根据时间保存相片，然后image_path作为全局变量，在onActivityResult(int requestCode, int resultCode, Intent data);继续使用

/**
     * 调用相机服务
     */
    public void takeCamera(){
        String path = Environment.getExternalStorageDirectory()+File.separator+Environment.DIRECTORY_DCIM;
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if(intent.resolveActivity(getPackageManager()) != null ){
            @SuppressWarnings("static-access")
            String temName = new DateFormat().format("yyMMdd_hhmmss",System.currentTimeMillis()) + "_" + (Math.random()*100)+".jpg";
            image_path = path + File.separator + temName;
            File file=new File(image_path);
            if(file.exists()){
                file.delete();
            }
            Uri uri=Uri.fromFile(file);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); 
            startActivityForResult(intent, CAMERA_REQUEST);
            Log.i("Target", "照相");
        }
    }

onActivityResult

在Activity跳转中很常用
这里用于系统服务和我们程序跳转，我想原理应该类似
onActivityResult(int requestCode, int resultCode, Intent data)不多说，生命周期
WARNING：

1. CAMERA_REQUEST中是通过image_path生成File再生成的Uri，没有使用Intent data中的数据
2. 在Fragment中调用MainActivity时候要强转为Activity类，即((MainActivity)getActivity()).takeCamera();
   这两点我在做的时候，疑惑了好久！后来发现，不难理解

源代码

MainActivity.java

//全局变量

    private Bitmap photo;
    //系统参数
    private String image_path;

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        
        if(requestCode == CAMERA_REQUEST && resultCode == RESULT_OK){
            File file=new File(image_path);
            try {
                Uri uri = Uri.fromFile(file);
                BitmapFactory.Options options=new BitmapFactory.Options();
                options.inJustDecodeBounds=true;                
                BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
                options.inSampleSize=4;
                options.inJustDecodeBounds=false;
                Bitmap map=BitmapFactory.decodeStream(getContentResolver().openInputStream(uri), null, options);
                android.provider.MediaStore.Images.Media.insertImage(getContentResolver(), map, null, null);
                sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE,uri));
//              image.setImageBitmap(map);
                photo = map;
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } 
        }
        
        if(requestCode == GALLERY_REQUET && resultCode == RESULT_OK){
            ContentResolver resolver = getContentResolver();
            Uri selectedImage = data.getData();  
            String[] filePathColumn = { MediaStore.Images.Media.DATA };  
       
            Cursor cursor = resolver.query(selectedImage,  
                     filePathColumn, null, null, null);  
            cursor.moveToFirst();  
            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);  
            String choosePicturePath = cursor.getString(columnIndex);  
            cursor.close(); 
            Log.i("Target",choosePicturePath);
            photo = BitmapFactory.decodeFile(choosePicturePath);
        }
    }

//========================华丽丽的分割线============================
//=========================调用系统服务============================
    
    
    /**
     * 调用相机服务
     */
    public void takeCamera(){
        String path = Environment.getExternalStorageDirectory()+File.separator+Environment.DIRECTORY_DCIM;
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        if(intent.resolveActivity(getPackageManager()) != null ){
            @SuppressWarnings("static-access")
            String temName = new DateFormat().format("yyMMdd_hhmmss",System.currentTimeMillis()) + "_" + (Math.random()*100)+".jpg";
            image_path = path + File.separator + temName;
            File file=new File(image_path);
            if(file.exists()){
                file.delete();
            }
            Uri uri=Uri.fromFile(file);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); 
            startActivityForResult(intent, CAMERA_REQUEST);
            Log.i("Target", "照相");
        }
    }
    
    
    /**
     * 调用相册服务
     */
    public void takePhoto(){
         Intent intent = null;
         String state = Environment.getExternalStorageState();  
         if (state.equals(Environment.MEDIA_MOUNTED)) {  
             intent=new Intent(Intent.ACTION_GET_CONTENT);
             intent.addCategory(Intent.CATEGORY_OPENABLE);
             intent.setType("image/*");
             intent.putExtra("cameraPhoto", true);
             startActivityForResult(intent, MainActivity.GALLERY_REQUET);
             }
             else {  
                 Toast.makeText(this, "请确认已经插入SD卡", Toast.LENGTH_LONG).show();  
             }  
             Log.i("Target", "选取照片");
    }