安卓基础知识回顾-----Intent的使用

Intent的使用

1、Activity之间的切换通过Intent来完成。

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.luxh.intent"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <!-- 第一个Activity -->
        <activity
            android:name="cn.luxh.intent.FirstActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <!-- 第二个Activity -->
        <activity
                android:name="cn.luxh.intent.SecondActivity"
                android:label="@string/second_activity">
                <intent-filter>
                       <action android:name="cn.luxh.intent.SecondActivity"/> <!--意图筛选器名称 -->
                       <category android:name="android.intent.category.DEFAULT"/><!--意图筛选器类别 -->
                </intent-filter>
        </activity>
    </application>

</manifest>

package cn.luxh.intent;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.content.Intent;

public class FirstActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_first);
        handleBtnJumpClick();
    }

    /**
     * 处理按钮点击事件
     */
    private void handleBtnJumpClick() {
        Button btn_jump = (Button) findViewById(R.id.btn_jump);
        btn_jump.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建一个Intent

                /*Intent intent = new Intent();
                intent.setClass(FirstActivity.this, SecondActivity.class);*/

                //通过意图筛选器名称创建Intent
                Intent intent = new Intent("cn.luxh.intent.SecondActivity");

                //启动新的Activity
                startActivity(intent);
            }
        });
    }

}

package cn.luxh.intent;

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.activity_second);
    }
}