Question

我试着用计数器拍照，当计数器变为0时，它必须拍照，但当计数器为0时，应用程序崩溃，并说功能图片失败，是否有人知道为什么？。提前谢谢。这是我的代码;

public class CapPhoto extends Activity {

private Camera camera;

private TextView textTimeLeft;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.capphoto);
textTimeLeft=(TextView)findViewById(R.id.textTimeLeft);
SurfaceView view = new SurfaceView(this);
camera = Camera.open();
try {
    camera.setPreviewDisplay(view.getHolder()); // feed dummy surface to surface
} catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
camera.startPreview();
new CountDownTimer(5000, 1000) {

     public void onTick(long millisUntilFinished) {

     }

     public void onFinish() {
         camera.takePicture(null, null, jpegCallBack);
     }
    }
    .start();

}

public void startTimer(View v){

// 5000ms=5s at intervals of 1000ms=1s so that means it lasts 5 seconds
new CountDownTimer(5000,1000){

    @Override
    public void onFinish() {
        // count finished
        textTimeLeft.setText("Picture Taken");
        camera.takePicture(null, null, null, jpegCallBack);
    }

    @Override
    public void onTick(long millisUntilFinished) {
        // every time 1 second passes
        textTimeLeft.setText("Seconds Left: "+millisUntilFinished/1000);
    }

}.start();
}

Camera.PictureCallback jpegCallBack=new Camera.PictureCallback() {      
public void onPictureTaken(byte[] data, Camera camera) {
    // set file destination and file name

File destination=new File(Environment.getExternalStorageDirectory(),"ddddddss.jpg");
    try {
        Bitmap userImage = BitmapFactory.decodeByteArray(data, 0, data.length);
        // set file out stream
        FileOutputStream out = new FileOutputStream(destination);
        // set compress format quality and stream
        userImage.compress(Bitmap.CompressFormat.JPEG, 90, out);        

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}
};
}

Answer 1

    private TextView textTimeLeft;
private Camera camera;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    textTimeLeft=(TextView)findViewById(R.id.textTimeLeft);
    SurfaceView view = new SurfaceView(this);
    camera = Camera.open();
    try {
        camera.setPreviewDisplay(view.getHolder()); // feed dummy surface to surface
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    camera.startPreview();


}
Camera.PictureCallback jpegCallBack=new Camera.PictureCallback() {      
    public void onPictureTaken(byte[] data, Camera camera) {
        // set file destination and file name
        File destination=new File(Environment.getExternalStorageDirectory(),"ddddddss.jpg");
        try {
            Bitmap userImage = BitmapFactory.decodeByteArray(data, 0, data.length);
            // set file out stream
            FileOutputStream out = new FileOutputStream(destination);
            // set compress format quality and stream
            userImage.compress(Bitmap.CompressFormat.JPEG, 90, out);        

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
};
public void startTimer(View v){

    new CountDownTimer(10000, 1000) {//CountDownTimer(edittext1.getText()+edittext2.getText()) also parse it to long

         public void onTick(long millisUntilFinished) {
             textTimeLeft.setText("Seconds Left: "+millisUntilFinished/1000);
         }

         public void onFinish() {
             camera.takePicture(null, null, null, jpegCallBack);
         }
        }
        .start();
    }
@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    camera.release();
}
}

将您的代码更改为此。

添加以下权限

<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

我的activity_main.xml是

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
    android:id="@+id/buttonStartTimer"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Start Timer"
    android:onClick="startTimer" />
<TextView 
    android:id="@+id/textTimeLeft"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text=""
    />

</LinearLayout>

Answer 2

我认为你应该释放相机资源onDestroy（）不是onPause（），一个错误是当你离开应用程序并返回onPause（）方法是trigerred和相机被释放然后它给出一个错误，除了一切似乎运行良好

拍照自动android错误拍照失败

2 个答案: