Android启动关闭Activity
Activity启动其他Activity有如下两个方法
startActivity(Intent intent) 启动其他Activity
startActivityForRequest(Intent intent,int requestCode)以指定的请求码(requestCode)启动Activity，该请求码由开发者根据业务自行设置，用于标识请求来源
Android为关闭Activity准备了如下两个方法
finish() 结束当前Activity
finishActivity(requestCode) 结束以startActivityForRequest(Intent intent,int requestCode)方法启动的Activity
这里我们通过一个例子来说明
建立两个Activity
start_activity.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"
tools:context=".MainActivity"
android:orientation="vertical">
<Button android:id="@+id/open"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="启动其他Activity"/>
</LinearLayout>
StartActivity.java
package com.example.openorcloseactivity;
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 StartActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.start_activity);
Button but=(Button) super.findViewById(R.id.open);
but.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(StartActivity.this, SecActivity.class);
//启动Activity
startActivity(intent);
}
});
}
}
sec_activity.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"
tools:context=".MainActivity"
android:orientation="vertical">
<Button android:id="@+id/finish"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="结束当前Activity，返回上一个"/>
<Button android:id="@+id/back"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="不结束当前，直接返回上一个Activity"/>
</LinearLayout>
SecActivity.java
package com.example.openorcloseactivity;
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 SecActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sec_activity);
Button finish=(Button) super.findViewById(R.id.finish);
//结束当前的Activity并返回上一个
finish.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(SecActivity.this, StartActivity.class);
//结束当前Activity
finish();
//启动上一个Activity
startActivity(intent);
}
});
Button back=(Button) super.findViewById(R.id.back);
//直接返回上一个Activity
back.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(SecActivity.this, StartActivity.class);
//启动上一个Activity
startActivity(intent);
}
});
}
}
在AndroidManifest.xml当中配置activity
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.openorcloseactivity"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.openorcloseactivity.StartActivity"
android:label="第一个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.openorcloseactivity.SecActivity"
android:label="第二个Activity"></activity>
</application>
</manifest>
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