定义界面布局

MainActivity.java:

 

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        Button btn1 = new Button(this);        btn1.setText("button1");        Button btn2 = new Button(this);        btn2.setText("Button2");        LinearLayout layout = new LinearLayout(this);        layout.setOrientation(LinearLayout.VERTICAL);        layout.addView(btn1);        layout.addView(btn2);        this.setContentView(layout);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    }