小编Moh*_*han的帖子

我已经制作了这个示例流程应用程序,但无法运行它我一直得到这个空指针异常请告诉我如何解决它,为什么我有它

我的主要活动课:

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SimpleServiceController extends Activity {

Button start1 = (Button)findViewById(R.id.start);
Button stop1 = (Button)findViewById(R.id.stop);
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    start1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            startService(new     Intent(SimpleServiceController.this,Service1.class));
        }
    });




    stop1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            stopService(new Intent(SimpleServiceController.this,Service1.class));


        }
    });



}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, …