显式与隐式启动Activity

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.metrox.l8">
 4
 5     <application
 6         android:allowBackup="true"
 7         android:icon="@mipmap/ic_launcher"
 8         android:label="@string/app_name"
 9         android:supportsRtl="true"
10         android:theme="@style/AppTheme">
11         <activity android:name=".MainActivity">
12             <intent-filter>
13                 <action android:name="android.intent.action.MAIN" />
14                 <category android:name="android.intent.category.LAUNCHER" />
15             </intent-filter>
16         </activity>
17         <activity android:name=".MyAty" android:label="显式" />
18         <activity android:name=".HideAty" android:label="隐式" android:exported="true">
19             <intent-filter>
20                 <category android:name="android.intent.category.DEFAULT"></category>
21                 <action android:name="com.example.metrox.l8.Intent.HideAty"></action>
22             </intent-filter>
23         </activity>
24     </application>
25
26 </manifest>

 1 package com.example.metrox.l8;
 2
 3 import android.support.v7.app.AppCompatActivity;
 4 import android.os.Bundle;
 5
 6 public class HideAty extends AppCompatActivity {
 7     public final  static  String ACTION = "com.example.metrox.l8.Intent.HideAty";
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         super.onCreate(savedInstanceState);
11         setContentView(R.layout.activity_hide_aty);
12     }
13 }

 1 package com.example.metrox.l8;
 2
 3 import android.support.v7.app.AppCompatActivity;
 4 import android.os.Bundle;
 5
 6 public class MyAty extends AppCompatActivity {
 7
 8     @Override
 9     protected void onCreate(Bundle savedInstanceState) {
10         super.onCreate(savedInstanceState);
11         setContentView(R.layout.activity_my_aty);
12     }
13 }

 1 package com.example.metrox.l8;
 2
 3 import android.content.DialogInterface;
 4 import android.content.Intent;
 5 import android.support.v7.app.AppCompatActivity;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.TextView;
 9
10 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
11
12
13     private TextView textView;
14
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19
20         textView = (TextView) findViewById(R.id.textView);
21         findViewById(R.id.button).setOnClickListener(this);
22         findViewById(R.id.button2).setOnClickListener(this);
23     }
24
25     @Override

 1 package com.example.metrox.l9;
 2
 3 import android.content.Intent;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7
 8 public class MainActivity extends AppCompatActivity {
 9
10     @Override
11     protected void onCreate(Bundle savedInstanceState) {
12         super.onCreate(savedInstanceState);
13         setContentView(R.layout.activity_main);
14         findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
15             @Override
16             public void onClick(View view) {
17                 startActivity(new Intent("com.example.metrox.l8.Intent.HideAty"));
18             }
19         });
20     }
21 }

26     public void onClick(View view) {
27         switch (view.getId()) {
28             case R.id.button:
29                 startActivity(new Intent(MainActivity.this,MyAty.class));
30                 break;
31             case R.id.button2:
32                 startActivity(new Intent(HideAty.ACTION));
33                 break;
34         }
35     }
36 }