Question

我一直在googleling但到目前为止还没有运气。我有一个应用程序，我启动一个ActivityForResult，并在其中我添加了一个字符串。

编辑因为我在桌子上，所以我无法发布复杂的代码，所以我只是在我的笔记本电脑上，所以这里的代码

ActivityForResult：

@Override
protected void onCreate(Bundle saved) {
    super.onCreate(saved);
    setContentView(R.layout.camera);
    a = new AQuery(this);
    output = getIntent().getExtras().getString("output");//Here, nothing is passed!!!!!!!!
    //Log.d("out",output);
    /** Check if this device has a camera */
    if (this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY)){
        text ="yes";
         //now we check the cam features
        if(this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT))
            front ="yes";
        if(this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH))
            flash = "yes";
        if(this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA))
            back= "yes";
    }else{
            text = "This device does not have a camera";
            //---set the data to pass back---
            data.putExtra("vid",text);
            setResult(RESULT_OK, data);
             //---close the activity---
             finish();
    }
    if (c != null) {
        c.release();
        c = null;
    } 
    m = new MediaRecorder();
    c = getCameraInstance(this);

    Camera.Parameters parameters = 
            c.getParameters();

    // Create our Preview view and set it as the content of our activity.
    mPreview = new CameraPreview(this, c);
    int orien =getResources().getConfiguration().orientation;
    if(orien ==1){
        parameters.setRotation(0); // set rotation to save the picture
        c.setDisplayOrientation(90);
        parameters.setPictureSize(640, 480);
        PIC_ORIENTATION = "landscape";
    }else{
        parameters.setRotation(0); // set rotation to save the picture
        c.setDisplayOrientation(0);
        parameters.setPictureSize(640, 480);
        PIC_ORIENTATION = "portrait";
    }
    if (Camera.getNumberOfCameras() < 2) {
        //TODO
    }
    fileUri = getOutputMediaFileUri();
    c.setParameters(parameters);
    m.setCamera(c);
    FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
    preview.addView(mPreview);
}

以及启动意图

cam.setOnClickListener(new OnClickListener(){

                @Override
                public void onClick(View v) {
                    Intent i = new Intent(Mess.this,Cam.class);
                    i.putExtra("output", vids);
                    startActivityForResult(i,2);
                    dialog.cancel();//TODO

                }

            });

没有传递任何值..它只是空... 这是activityForResult ...但是在Activity中，我得到了传递的值。

Answer 1

您这样做是为了放置值：

i.putExtra("string","value");

然后执行此操作以获取值：

String value = getIntent().getExtras().getString("value");

第二行应该是

String value = getIntent().getExtras().getString("string");

Answer 2

经过一些当之无愧的休息之后，我清理了头并查看了代码...问题是我没有初始化输出字符串，因此当把额外的东西放在Intent中时，它是一个未设置的字符串......现在让它工作了

获得额外的onactivityResult

2 个答案: