相关疑难解决方法(0)

我是一个Android初学者.在尝试管理活动生命周期的代码时,我遇到了一件新事物.

package com.example.activitylaunch;

import android.os.Build;
import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

TextView mTextView;

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

    mTextView = (TextView) findViewById(R.id.text_message);

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
    {
        ActionBar actionBar = getActionBar();
        actionBar.setHomeButtonEnabled(false);
    }
    }

@Override
public void onDestroy(){
    super.onDestroy();
    android.os.Debug.stopMethodTracing();
}

@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 …