android显式启动与隐式启动

package com.example.start_5;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {private Button btn1;private Button btn2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btn1 = (Button) findViewById(R.id.button1);btn2 = (Button) findViewById(R.id.button2);btn1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO 自动生成的方法存根/// /显示启动Intent intent = new Intent(MainActivity.this, Layout2.class);startActivity(intent);Toast.makeText(MainActivity.this, "显示启动", Toast.LENGTH_SHORT).show();}});btn2.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO 自动生成的方法存根/// //隐士启动Intent intent = new Intent("com.example.start_5.Layout2");startActivity(intent);Toast.makeText(MainActivity.this, "隐士启动", Toast.LENGTH_SHORT).show();}});}}

package com.example.start_5;import android.app.Activity;import android.os.Bundle;public class Layout2 extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.layout2);}}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.start_5"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="15"        android:targetSdkVersion="16" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name=".Layout2"            android:label="第二个界面" >            <intent-filter>                <action android:name="com.example.start_5.Layout2" />    //////这里要是完整路径                <category android:name="android.intent.category.DEFAULT" />  //这个要是DEFAULT            </intent-filter>        </activity>    </application></manifest>

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