安卓實現QQ強制下線----來自第一行代碼

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首先需要一個能包含所有活動的類   到最後可以調用這個對象的方法 銷毀所有活動

 

package com.example.broadcastbestpractice;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;

public class ActivityCollector {

private static List<Activity> activities = new ArrayList<Activity>();

public static void addActivity(Activity activity) {
activities.add(activity);
}

public static void removeActivity(Activity activity) {
activities.remove(activity);
}

public static void finishAll() {
for (Activity activity : activities) {
if (!activity.isFinishing()) {
activity.finish();
}
}
}

}

//需要所有類繼承這個類 

package com.example.broadcastbestpractice;

import android.app.Activity;
import android.os.Bundle;

public class BaseActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityCollector.addActivity(this);
}

@Override
protected void onDestroy() {
super.onDestroy();
ActivityCollector.removeActivity(this);
}

}

 

 

登入活動 

package com.example.broadcastbestpractice;

import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.Toast;

//登入活動
public class LoginActivity extends BaseActivity {


//使用者名稱視圖
private EditText accountEdit;

//密碼視圖
private EditText passwordEdit;

//登入按鈕視圖
private Button login;

//單選框視圖
private CheckBox rememberPass;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
//擷取相應的視圖對象
accountEdit = (EditText) findViewById(R.id.account);
passwordEdit = (EditText) findViewById(R.id.password);
rememberPass = (CheckBox) findViewById(R.id.remember_pass);
login = (Button) findViewById(R.id.login);

//為登入按鈕添加事件

login.setOnClickListener(new OnClickListener() {
@Override
public 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 or password is invalid",
Toast.LENGTH_SHORT).show();
}
}
});
}

}

 

介面

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stretchColumns="1" >

<TableRow>

<TextView
android:layout_height="wrap_content"
android:text="使用者名稱:" />

<EditText
android:id="@+id/account"
android:layout_height="wrap_content"
android:hint="請輸入使用者名稱" />
</TableRow>

<TableRow>

<TextView
android:layout_height="wrap_content"
android:text="密碼:" />

<EditText
android:id="@+id/password"
android:layout_height="wrap_content"
android:inputType="textPassword" />
</TableRow>

<TableRow>

<CheckBox
android:id="@+id/remember_pass"
android:layout_height="wrap_content" />

<TextView
android:layout_height="wrap_content"
android:text="記住 密碼" />
</TableRow>

<TableRow>

<Button
android:id="@+id/login"
android:layout_height="wrap_content"
android:layout_span="2"
android:text="登入" />
</TableRow>

</TableLayout>

 

另外一個活動來測試強制下線

package com.example.broadcastbestpractice;

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

public class MainActivity extends BaseActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button forceOffline = (Button) findViewById(R.id.force_offline);
forceOffline.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("666");
Intent intent = new Intent(
"com.example.broadcastbestpractice.FORCE_OFFLINE");
sendBroadcast(intent);
}
});
}

}

 

介面

<?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" >

<Button
android:id="@+id/force_offline"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Send force offline broadcast" />

</LinearLayout>

 

強制下線廣播接收器

package com.example.broadcastbestpractice;

import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.WindowManager;

public class ForceOfflineReceiver extends BroadcastReceiver {

@Override
public void onReceive(final Context context, Intent intent) {
System.out.println("555");
//彈出強制下線對話方塊
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(context);
dialogBuilder.setTitle("Warning");
dialogBuilder
.setMessage("You are forced to be offline. Please try to login again.");
dialogBuilder.setCancelable(false);
//為對話方塊按鈕添加事件
dialogBuilder.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
//點擊確定後銷毀所有活動
ActivityCollector.finishAll();
//啟動登入活動
Intent intent = new Intent(context, LoginActivity.class);
System.out.println(context);
//因為是在接收器中啟動活動需要委任標記位
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
AlertDialog alertDialog = dialogBuilder.create();
//
////設定對話方塊的類型 保證在廣播接收器中可以正常彈出
alertDialog.getWindow().setType(
WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alertDialog.show();
}

}

 

註冊檔案

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.broadcastbestpractice"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >

<activity
android:name=".LoginActivity"
android:label="mylogin" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

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

<receiver android:name=".ForceOfflineReceiver" >
<intent-filter>
<action android:name="com.example.broadcastbestpractice.FORCE_OFFLINE" />
</intent-filter>
</receiver>

</application>

</manifest>

安卓實現QQ強制下線----來自第一行代碼