这段代码与我一起工作，除了主按钮，它没有去主菜单类

Question

任何人都可以帮忙

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class FlashLightActivity extends Activity {

Button main;
//flag to detect flash is on or off
private boolean isLighOn = false;

private Camera camera;

private Button button;
@Override
protected void onStop() {
    super.onStop();
    if (camera != null) {
        camera.release();
    }
}


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

这里的问题

    main=(Button)this.findViewById(R.id.main);
    main.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Toast.makeText(FlashLightActivity.this, "main",Toast.LENGTH_LONG).show();
            Intent myinIntent=new Intent(v.getContext(),MainMenu.class); 
            startActivity(myinIntent);
            //this.finish();

        }

    });

This Work will

    button = (Button) findViewById(R.id.buttonFlashlight);

    Context context = this;
    PackageManager pm = context.getPackageManager();
    // if device support camera?
    if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
        Log.e("err", "Device has no camera!");
        return;
    }
    camera = Camera.open();
    final Parameters p = camera.getParameters();
    button.setOnClickListener(new OnClickListener() {

flash work here

        @Override
        public void onClick(View arg0) {
            if (isLighOn) {
                Log.i("info", "torch is turn off!");
                p.setFlashMode(Parameters.FLASH_MODE_OFF);
                camera.setParameters(p);
                camera.stopPreview();
                isLighOn = false;
            } else {
                Log.i("info", "torch is turn on!");
                p.setFlashMode(Parameters.FLASH_MODE_TORCH);
                camera.setParameters(p);
                camera.startPreview();
                isLighOn = true;
            }
        }
    });


    }
}

不是所有的活动都有在按下BACK键时被销毁的行为。当用户开始在音乐应用程序中播放音乐，然后按后退键，应用程序覆盖正常的后退行为，防止播放器活动被破坏，并继续播放音乐，即使它的活动不再可见

Answer 1

尝试替换:-

Intent myinIntent=new Intent(v.getContext(),MainMenu.class);

Intent myinIntent=new Intent(this,MainMenu.class);