Activity跳轉的幾種方式

今天來說說Activity的跳轉的三種方式：1. 顯示跳轉；2. 隱式跳轉；3. ComponentName方式跳轉。

一、顯示跳轉

Intent intent2 = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(intent2);

二、隱式跳轉

1. java代碼

Intent intent3 = new Intent();
intent3.setAction("com.czj.yinshi");
tartActivity(intent3);

2. AndroidMainifest.xml配置

 <activity android:name=".YinshiActivity">
            <intent-filter>
                <action android:name="com.czj.yinshi"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
 </activity>

三、ConponentName方式跳轉

Intent intent1 = new Intent();
intent1.setComponent(new ComponentName("com.czj.componentnamedemo",
                        "com.czj.componentnamedemo.SecondActivity"));
startActivity(intent1);

下面是具體的代碼：

1. MainActivity.java

package com.czj.componentnamedemo;

import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button button1,button2,button3;

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

        button1 = (Button) findViewById(R.id.btn1);
        button2 = (Button) findViewById(R.id.btn2);
        button3 = (Button) findViewById(R.id.btn3);
        button1.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.btn1: //ComponentName方式跳轉
                Intent intent1 = new Intent();

		//參數一：包名   參數二：SecondActivity 的全包名
                intent1.setComponent(new ComponentName("com.czj.componentnamedemo",
                        "com.czj.componentnamedemo.SecondActivity"));
                startActivity(intent1);
                break;
            case R.id.btn2:
                Intent intent2 = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(intent2);
                break;

            case R.id.btn3:
                Intent intent3 = new Intent();
                intent3.setAction("com.czj.yinshi");
                startActivity(intent3);
                break;
            default:
                break;
        }

    }
}

2. AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.czj.componentnamedemo">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>

        <activity android:name=".SecondActivity"/>

        <activity android:name=".YinshiActivity">
            <intent-filter>
                <action android:name="com.czj.yinshi"/>
                <category android:name="android.intent.category.DEFAULT"/>

</intent-filter> </activity> </application></manifest>

//隱式跳轉要注意下面 

<action android:name="com.czj.yinshi"/>
<category android:name="android.intent.category.DEFAULT"/>