Android学习历程-Activity生命周期
里面写了三个Activity:
package com.example.activity.life.cycle;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class FirstActivity extends Activity {
private Button button = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println("FirstActivity---> onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.first_activity);
button = (Button)findViewById(R.id.firstButton);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(FirstActivity.this, SecondActivity.class);
FirstActivity.this.startActivity(intent);
}
});
}
@Override
protected void onDestroy() {
System.out.println("FirstActivity---> onDestroy");
super.onDestroy();
}
@Override
protected void onPause() {
System.out.println("FirstActivity---> onPause");
super.onPause();
}
@Override
protected void onRestart() {
System.out.println("FirstActivity---> onRestart");
super.onRestart();
}
@Override
protected void onResume() {
System.out.println("FirstActivity---> onResume");
super.onResume();
}
@Override
protected void onStart() {
System.out.println("FirstActivity---> onStart");
super.onStart();
}
@Override
protected void onStop() {
System.out.println("FirstActivity---> onStop");
super.onStop();
}
}
package com.example.activity.life.cycle;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class SecondActivity extends Activity {
private Button button = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println("SecondActivity:>>>>----- onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.second_activity);
button = (Button) findViewById(R.id.secondButton);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(SecondActivity.this, ThirdActivity.class);
SecondActivity.this.startActivity(intent);
finish();
}
});
}
@Override
protected void onDestroy() {
System.out.println("SecondActivity:>>>>----- onDestroy");
super.onDestroy();
}
@Override
protected void onPause() {
System.out.println("SecondActivity:>>>>----- onPause");
super.onPause();
}
@Override
protected void onRestart() {
System.out.println("SecondActivity:>>>>----- onRestart");
super.onRestart();
}
@Override
protected void onResume() {
System.out.println("SecondActivity:>>>>----- onResume");
super.onResume();
}
@Override
protected void onStart() {
System.out.println("SecondActivity:>>>>----- onStart");
super.onStart();
}
@Override
protected void onStop() {
System.out.println("SecondActivity:>>>>----- onStop");
super.onStop();
}
}
package com.example.activity.life.cycle;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class ThirdActivity extends Activity {
private Button button = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
System.out.println("ThirdActivity:>>>>----- onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.third_acitvity);
button =(Button)findViewById(R.id.thirdButton);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Uri uri = Uri.parse("smsto://08000000123");
Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
intent.putExtra("sms_body", "The SMS text");
ThirdActivity.this.startActivity(intent);
}
});
}
@Override
protected void onDestroy() {
System.out.println("ThirdActivity:>>>>----- onDestroy");
super.onDestroy();
}
@Override
protected void onPause() {
System.out.println("ThirdActivity:>>>>----- onPause");
super.onPause();
}
@Override
protected void onRestart() {
System.out.println("ThirdActivity:>>>>----- onRestart");
super.onRestart();
}
@Override
protected void onResume() {
System.out.println("ThirdActivity:>>>>----- onResume");
super.onResume();
}
@Override
protected void onStart() {
System.out.println("ThirdActivity:>>>>----- onStart");
super.onStart();
}
@Override
protected void onStop() {
System.out.println("ThirdActivity:>>>>----- onStop");
super.onStop();
}
}
三个布局文件：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:id="@+id/firstTextView" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/first_activite" /> <Button android:id="@+id/firstButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="路转到第二个Activity"/> </LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/secondTextView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="第二个activity"
/>
<Button
android:id="@+id/secondButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="跳轉到ThirdActivity"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/thirdButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="跳轉到發送信息Activity"/>
</LinearLayout>
string.xml文件：
<resources>
<string name="app_name">ActivityLifeCycle</string>
<string name="first_activite">First Activity</string>
</resources>
Mainfest.xml文件：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.activity.life.cycle"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.activity.life.cycle.FirstActivity"
android:label="第一個Activity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.activity.life.cycle.SecondActivity"
android:label="第二個Activity" >
</activity>
<activity
android:name="com.example.activity.life.cycle.ThirdActivity"
android:label="第三個Activity">
</activity>
</application>
</manifest>
