版权声明:本文为博主原创文章,未经博主允许不得转载。 https://blog.csdn.net/sunshunli/article/details/83821043
强制下线是一种很常见的场面,比如我们的qq被别人登陆了,那么你就会强制下线。
它的思路是什么样的呢。
其实也并不难,我们只需要在界面上弹出一个对话框,让用户无法进行其他操作,必须点击对话框的确定按钮,然后返回登录界面。
但存在一个问题,我们被强制下线时,我们可能正在打游戏,咔擦,完了,一个对话框弹出来,你游戏就gg了。
强制下线需要关闭所有的活动,然后回到登录界面。
配置文件mainifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sunshunli.broadcastbestpractice">
<application
android: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=".MainActivity">
</activity>
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
mainactivity:
package com.example.sunshunli.broadcastbestpractice;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
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 = findViewById(R.id.fore_offlinen);
forceoffline.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent("com.example.broadcastpractice.FORCE_OFFLINE");
sendBroadcast(intent);
}
});
}
}
Baseactivivty
package com.example.sunshunli.broadcastbestpractice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
public class BaseActivity extends AppCompatActivity{
private ForceOfflineReceive receiver;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityCollector.addActivity(this);
}
@Override
protected void onPostResume() {
super.onPostResume();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("com.example.broadcastpractice.FORCE_OFFLINE");
receiver = new ForceOfflineReceive();
registerReceiver(receiver,intentFilter);
}
@Override
protected void onPause() {
super.onPause();
if(receiver!=null){
unregisterReceiver(receiver);
receiver=null;
}
}
protected void onDestory(){
super.onDestroy();
ActivityCollector.removeActivity(this);
}
class ForceOfflineReceive extends BroadcastReceiver{
@Override
public void onReceive(final Context context, Intent intent) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Warning");
builder.setMessage("You are force to be offline ,please try to login again");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
ActivityCollector.finshall();
Intent intent =new Intent(context,LoginActivity.class);
context.startActivity(intent);
}
});
builder.show();
}
}
}
loginactivity:
package com.example.sunshunli.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 accoutEdit;
private EditText passwordEdit;
private Button login;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
accoutEdit=findViewById(R.id.account);
passwordEdit=findViewById(R.id.password);
login=findViewById(R.id.login);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String account = accoutEdit.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 error", Toast.LENGTH_SHORT).show();
}
}
});
}
}
activitycollector:
package com.example.sunshunli.broadcastbestpractice;
import android.app.Activity;
import java.util.ArrayList;
import java.util.List;
public class ActivityCollector {
public static List<Activity> activities = new ArrayList<>();
public static void addActivity(Activity activity){
activities.add(activity);
}
public static void removeActivity(Activity activity){
activities.remove(activity);
}
public static void finshall(){
for (Activity activity :activities){
if (!activity.isFinishing()){
activity.finish();
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".LoginActivity">
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="60dp">
<TextView
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textSize="18sp"
android:text="Account:"
/>
<EditText
android:layout_width="0dp"
android:layout_weight="1"
android:id="@+id/account"
android:layout_gravity="center_vertical"
android:layout_height="wrap_content" />
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="60dp">
<TextView
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:textSize="18sp"
android:text="Password:"
/>
<EditText
android:layout_width="0dp"
android:layout_weight="1"
android:id="@+id/password"
android:layout_gravity="center_vertical"
android:layout_height="wrap_content"
android:inputType="textPassword"/>
</LinearLayout>
<Button
android:id="@+id/login"
android:text="login"
android:layout_width="match_parent"
android:layout_height="60dp" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/fore_offlinen"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="send force offioce broadcast"/>
</LinearLayout>