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<RelativeLayout?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:paddingBottom="@dimen/activity_vertical_margin"
????android:paddingLeft="@dimen/activity_horizontal_margin"
????android:paddingRight="@dimen/activity_horizontal_margin"
????android:paddingTop="@dimen/activity_vertical_margin"
????tools:context="com.example.activity_05.MainActivity"?>
?
????<TextView
????????android:id="@+id/textView1"
????????android:layout_width="wrap_content"
????????android:layout_height="wrap_content"
????????android:text="@string/hello_world"?/>
?
????<Button
????????android:id="@+id/button1"
????????android:layout_width="fill_parent"
????????android:layout_height="wrap_content"
????????android:layout_below="@+id/textView1"
????????android:layout_marginTop="22dp"
????????android:text="启动第二个Activity"?/>
?
</RelativeLayout>
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<?xml?version="1.0"?encoding="utf-8"?>
<LinearLayout?xmlns:android="http://schemas.android.com/apk/res/android"
????android:layout_width="match_parent"
????android:layout_height="match_parent"
????android:orientation="vertical"?>
?
????<TextView
????????android:id="@+id/textView1"
????????android:layout_width="fill_parent"
????????android:layout_height="wrap_content"
????????android:text="This?is?the?second?activity"?/>
?
</LinearLayout>
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package?com.example.activity_05;
?
import?android.support.v7.app.ActionBarActivity;
import?android.content.Intent;
import?android.os.Bundle;
import?android.view.Menu;
import?android.view.MenuItem;
import?android.view.View;
import?android.widget.Button;
import?android.view.View.OnClickListener;
?
public?class?MainActivity?extends?ActionBarActivity?{
????private?Button?button;
?
????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????System.out.println("MainActivity?onCreate：第一次调用Activity的时候执行");
????????setContentView(R.layout.activity_main);
????????button?=?(Button)?findViewById(R.id.button1);
????????button.setOnClickListener(new?OnClickListener()?{
?????????????????????????@Override
????????????public?void?onClick(View?v)?{
????????????????Intent?intent?=?new?Intent();
????????????????intent.setClass(MainActivity.this,?SecondActivity.class);
????????????????MainActivity.this.startActivity(intent);
????????????}
????????});
????}
?????????@Override
????protected?void?onResume()?{
????????System.out.println("MainActivity?onResume");
????????super.onResume();
????}
????????????//以上三个方法执行完毕之后这个Activity就可以使用了?
?????????@Override
????protected?void?onStart()?{
?????????System.out.println("MainActivity?onStart：Activity处于可见状态的时候调用");
????????super.onStart();
????}
?????????@Override
????protected?void?onRestart()?{
????????System.out.println("MainActivity?onRestart：Activity又可以得到用户焦点的时候调用");
????????System.out.println("当从第二个Activity又回到第一个Activity时调用此方法");
????????System.out.println("然后调用onResume方法就可以显示出来");
????????System.out.println("然后调用第二个Activity的onStop、onDestroy。第二个Activity就被销毁掉了");
????????super.onRestart();
????}
?????????@Override
????protected?void?onPause()?{
????????System.out.println("MainActivity?onPause");
????????System.out.println("如果在执行当前Activity的时候又启动了一个Activity就会调用当前Activity的此方法");
????????System.out.println("然后依次调用新启动的Activity的onCreate、onStart、onResume");
????????System.out.println("然后调用第一个Activity的onStop方法");
????????super.onPause();
????}
?????????@Override
????protected?void?onStop()?{
????????System.out.println("MainActivity?onStop");
????????//如果第二个Activity把第一个Activity完全遮挡住就调用这个函数
????????super.onStop();
????}
?????????@Override
????protected?void?onDestroy()?{
????????System.out.println("MainActivity?onDestroy");
????????super.onDestroy();
????}
} |
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package?com.example.activity_05;
?
import?android.app.Activity;
import?android.os.Bundle;
?
public?class?SecondActivity?extends?Activity?{
????@Override
????protected?void?onCreate(Bundle?savedInstanceState)?{
????????super.onCreate(savedInstanceState);
????????setContentView(R.layout.second);
????}
?????????@Override
????protected?void?onStart()?{
????????System.out.println("SecondActivity?onStart");
????????super.onStart();
????}
?????????@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?onPause()?{
????????System.out.println("SecondActivity?onPause");
????????super.onPause();
????}
?????????@Override
????protected?void?onStop()?{
????????System.out.println("SecondActivity?onStop");
????????super.onStop();
????}
?????????@Override
????protected?void?onDestroy()?{
????????System.out.println("SecondActivity?onDestroy");
????????super.onDestroy();
????}
} |
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<activity?android:name=".SecondActivity"?android:label="第二个Activity"/>
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?
原文：http://jlins.iteye.com/blog/2157163
