先把所有的代碼貼出來然後一個一個複習
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.admin.broadcastbestpracticw">
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
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">
</activity>
<receiver android:name=".ForceOfflineReceiver">
<intent-filter>
<action android:name="com.example.broadcastbewspractice.FORCE_OFFLINE"/>
</intent-filter>
</receiver>
</application>
</manifest>
然後是第一個 Activity 管理器類
package com.example.admin.broadcastbestpracticw;
import android.app.Activity;
import java.util.ArrayList;
import java.util.List;
/**
* Created by admin on 2016/3/18.
*/
public class ActivityCollector {
public 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();
}
}
}
}
第二個 所有活動的父類
package com.example.admin.broadcastbestpracticw;
import android.app.Activity;
import android.os.Bundle;
/**
* Created by admin on 2016/3/18.
*/
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);
}
}
第三個 登錄界面 設計
package com.example.admin.broadcastbestpracticw;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
/**
* Created by admin on 2016/3/18.
*/
public class LoginActivity extends BaseActivity{
private EditText accountEdit;
private EditText passwordEdit;
private Button login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
accountEdit= (EditText) findViewById(R.id.account);
passwordEdit= (EditText) findViewById(R.id.password);
login= (Button) findViewById(R.id.login);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String account=accountEdit.getText().toString();
String password=passwordEdit.getText().toString();
//如果賬號是admin密碼是123456 就認爲登陸成功
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();;
}
}
});
}
}
第四個 主界面 設置
package com.example.admin.broadcastbestpracticw;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
@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 View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent("com.example.broadcastbewspractice.FORCE_OFFLINE");
sendBroadcast(intent);
}
});
}
}
然後是廣播接收器
package com.example.admin.broadcastbestpracticw;
import android.app.AlertDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.WindowManager;
/**
* Created by admin on 2016/3/18.
*/
public class ForceOfflineReceiver extends BroadcastReceiver {
@Override
public void onReceive(final Context context, final Intent intent) {
//用AlertDialog來創建一個對話框
AlertDialog.Builder dialogBuilder=new AlertDialog.Builder(context);
dialogBuilder.setTitle("Warning!!!!");
dialogBuilder.setMessage("你已被強制下線,請再次登錄");
dialogBuilder.setCancelable(false);
dialogBuilder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ActivityCollector.finishAll();
Intent intent = new Intent(context, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
AlertDialog alertDialog=dialogBuilder.create();
alertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
alertDialog.show();
}
}