Android - LearnActivity

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public class MainActivity extends Activity implements OnClickListener{Button btn_exit;Button btn_next;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);  //调用父类的生命周期创建方法setContentView(R.layout.activity_main);  //设置要使用的布局文件//requestWindowFeature(Window.FEATURE_NO_TITLE);  //没有标题栏btn_exit = (Button) findViewById(R.id.btn_exit);btn_exit.setOnClickListener(this);btn_next = (Button) findViewById(R.id.btn_next);btn_next.setOnClickListener(this);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {//inflate(资源文件 , menu对象)getMenuInflater().inflate(R.menu.main, menu);  return true;  //true:允许该菜单显示}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case R.id.add_item://提示信息Toast.makeText(MainActivity.this, "Add", Toast.LENGTH_LONG).show();break;case R.id.remove_item:Toast.makeText(MainActivity.this, "Remove", Toast.LENGTH_LONG).show();break;default:break;}return true;}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_exit:finish();  //销毁本活动break;case R.id.btn_next://Intent用于组件间交互Intent intent = new Intent(MainActivity.this, SecondActivity.class);  //定义一个意图startActivity(intent);  //使用该意图break;default:break;}}}

public class SecondActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);  //调用父类的生命周期创建方法setContentView(R.layout.activity_second);  //设置要使用的布局文件}}

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button         android:id="@+id/btn_exit"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="退出" />    <Button         android:id="@+id/btn_next"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="跳转" /></LinearLayout>

activity_second.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <TextView         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="这里是SecondActivity。"        android:textSize="20sp" /></LinearLayout>

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