項目文件GitHub地址：

https://github.com/Skymqq/BroadcastBestPractice.git

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新建BoradcastBestPractice項目。

首先我們需要制作一個登錄界面，并且定義它為第一個顯示的界面。

新建LoginActivity.java，代碼如下：

package com.example.administrator.broadcastbestpractice;import android.content.Intent; import android.os.Bundle; import android.support.annotation.Nullable; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast;public class LoginActivity extends BaseActivity {private EditText accountEdit;private EditText passwordEdit;private Button login;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_login);initializeView();}private void initializeView() {accountEdit=(EditText)findViewById(R.id.account);passwordEdit=(EditText)findViewById(R.id.password);login=(Button)findViewById(R.id.login);login.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {String account=accountEdit.getText().toString();String password=passwordEdit.getText().toString();if (account.equals("admin") && password.equals("123456")){Intent intent=new Intent(LoginActivity.this,MainActivity.class);startActivity(intent);finish();}else {Toast.makeText(LoginActivity.this, "account of password is invalid", Toast.LENGTH_SHORT).show();}}});}}

activity_login.xml代碼：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="60dp"android:orientation="horizontal"><TextViewandroid:layout_width="90dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:text="Account:"android:textSize="18sp" /><EditTextandroid:id="@+id/account"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_weight="1" /></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="60dp"android:orientation="horizontal"><TextViewandroid:layout_width="90dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:text="Password:"android:textSize="18sp" /><EditTextandroid:id="@+id/password"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_gravity="center_vertical"android:layout_weight="1"android:inputType="textPassword" /></LinearLayout><Buttonandroid:id="@+id/login"android:layout_width="match_parent"android:layout_height="60dp"android:text="Login" /></LinearLayout>

然后再將AndroidManifest.xml中的代碼改一下：

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.administrator.broadcastbestpractice"><applicationandroid:allowBackup="true"android:icon="@mipmap/ic_launcher"android:label="@string/app_name"android:roundIcon="@mipmap/ic_launcher_round"android:supportsRtl="true"android:theme="@style/AppTheme"><activity android:name=".LoginActivity"><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><activity android:name=".MainActivity"/></application></manifest>

MainActivity.java代碼：

package com.example.administrator.broadcastbestpractice;import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button;public class MainActivity extends BaseActivity {private ForceOfflineBroadcast receiver;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ActivityCollector.addActivity(this);Button forceOffline=(Button)findViewById(R.id.force_offline);forceOffline.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent("com.example.broadcastbestpractice.FORCE_OFFLINE");sendBroadcast(intent);}});}@Overrideprotected void onResume() {super.onResume();IntentFilter intentFilter=new IntentFilter();intentFilter.addAction("com.example.broadcastbestpractice.FORCE_OFFLINE");receiver=new ForceOfflineBroadcast();registerReceiver(receiver,intentFilter);}@Overrideprotected void onPause() {super.onPause();if (receiver!=null){unregisterReceiver(receiver);receiver=null;}}@Overrideprotected void onDestroy() {super.onDestroy();}private class ForceOfflineBroadcast extends BroadcastReceiver {@Overridepublic void onReceive(final Context context, final Intent intent) {AlertDialog.Builder builder=new AlertDialog.Builder(context);builder.setTitle("Warning").setMessage("You are forced to be offline. Please try to login again.").setCancelable(false).setPositiveButton("Ok", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {ActivityCollector.finishAll();//銷毀所有活動Intent intent=new Intent(context,LoginActivity.class);context.startActivity(intent);}}).show();}} }

activity_main.xml代碼：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><Buttonandroid:id="@+id/force_offline"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="Send Force offline broadcast"android:textAllCaps="false" /> </LinearLayout>

運行程序，（用戶名：admin? 密碼：123456）效果圖：

登錄成功，進入MainActivity活動

在MainActivity活動中點擊btn按鈕彈出對話框提示

點擊OK，強制下線，又回到了登錄界面。

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