27.体验活动的生命周期

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1.新建ActivityLifeCycleTest项目。
2.新建两个子活动NormalActivity和DialogActivity并生成相应布局。

normal_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.activitylifecycletest.NormalActivity">    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="This is a normal activity"/></LinearLayout>

dialog_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.activitylifecycletest.DialogActivity">    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="This is a dialog activity"/></LinearLayout>

3.修改AndroidManifest.xml的<activity>标签配置

<activity android:name=".NormalActivity" />        <activity android:name=".DialogActivity"            android:theme="@android:style/Theme.Dialog">        </activity>

这里写图片描述
4.修改activity_main.xml，定义了两个按钮，一个用于启动NormalActivity，一个用于启动DialogActivity。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.activitylifecycletest.MainActivity">    <Button        android:id="@+id/start_normal_activity"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Start NormalActivity"/>    <Button        android:id="@+id/start_dialog_activity"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Start DialogActivity"/></LinearLayout>

5.修改MainActivity

public class MainActivity extends AppCompatActivity {    public static final String TAG = "MainActivity";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button startNormalActivity = (Button) findViewById(R.id.start_normal_activity);        Button startDialogActivity = (Button) findViewById(R.id.start_dialog_activity);        startNormalActivity.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this,NormalActivity.class);                startActivity(intent);            }        });        startDialogActivity.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(MainActivity.this,DialogActivity.class);                startActivity(intent);            }        });    }    @Override    protected void onStart() {        super.onStart();        Log.d(TAG,"onStart");    }    @Override    protected void onResume() {        super.onResume();        Log.d(TAG,"onResume");    }    @Override    protected void onPause() {        super.onPause();        Log.d(TAG,"onPause");    }    @Override    protected void onStop() {        super.onStop();        Log.d(TAG,"onStop");    }    @Override    protected void onDestroy() {        super.onDestroy();        Log.d(TAG,"onDestroy");    }    @Override    protected void onRestart() {        super.onRestart();        Log.d(TAG,"onRestart");    }}

这里写图片描述

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