android programing 5.5,Java语言交流,技术交流,鱼C论坛

alltolove 发表于 2017-10-11 10:23:52

android programing 5.5

今天这个项目很简单，先新建个项目，在mainactivity.java旁边新建ActivityCollector.javapackage com.example.xinwei.broadcastbestpractice;

import android.app.Activity;

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

/**
* Created by xinwei on 2017/10/11.
*/

public class ActivityCollector {
public static List<Activity> activitys=new ArrayList<>();
public static void addActivity(Activity activity){
   activitys.add(activity);
}
public static void removeActivity(Activity activity){
   activitys.remove(activity);
}
public static void finishAll(){
   for (Activity activity:activitys
         ) {
         if(!activity.isFinishing()){
            activity.finish();
         }
   }
}
}

然后新建BaseActivity.javapackage com.example.xinwei.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;
import android.util.Log;

/**
* Created by xinwei on 2017/10/11.
*/

public class BaseActivity extends AppCompatActivity {
private ForceOffLineReceiver receiver;

@Override
protected void onResume() {
   super.onResume();
   IntentFilter intentFilter=new IntentFilter();
   intentFilter.addAction("alltolove.FORCE_OFFLINE");
   receiver=new ForceOffLineReceiver();
   registerReceiver(receiver,intentFilter);
}

@Override
protected void onPause() {
   super.onPause();
   if(receiver!=null){
         unregisterReceiver(receiver);
         receiver=null;
   }
}

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

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

}

再建个ForceOffLineReceiver.java文件
package com.example.xinwei.broadcastbestpractice;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.util.Log;

public class ForceOffLineReceiver extends BroadcastReceiver {

@Override
public void onReceive(final Context context, Intent intent) {
   Log.i("a","send");
   AlertDialog.Builder builder=new AlertDialog.Builder(context);
   builder.setTitle("Warning");
   builder.setMessage("You are force to be offline,Please try to login again");
   builder.setCancelable(false);
   builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
         @Override
         public void onClick(DialogInterface dialogInterface, int i) {
            ActivityCollector.finishAll();
            Intent intent = new Intent(context,LoginActivity.class);
            context.startActivity(intent);
         }
   });
   builder.show();
}
}

然后新建LoginActivity.java这个Activity（建活动空项目），修改系统自动生成的activity_login.xml文件<?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">
<LinearLayout
   android:orientation="horizontal"
   android:layout_width="wrap_content"
   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:id="@+id/account"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:layout_gravity="center_vertical"/>
</LinearLayout>
<LinearLayout
   android:orientation="horizontal"
   android:layout_width="wrap_content"
   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:id="@+id/password"
         android:layout_width="90dp"
         android:layout_height="wrap_content"
         android:layout_gravity="center_vertical"
         android:inputType="textPassword"/>
</LinearLayout>
<Button
   android:id="@+id/login"
   android:layout_width="match_parent"
   android:layout_height="60dp"
   android:text="Login"/>
</LinearLayout>

接下来修改LoginActivity.java的代码package com.example.xinwei.broadcastbestpractice;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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;
@Override
protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_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 view) {
            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();
            }
         }
   });
}
}
然后修改AndroidManifest.xml文件，目的是把一开始启动的活动更改成LoginActivity,以下为代码<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.xinwei.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>注意：里面的包名不要照抄

然后修改activity_main.xml<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.xinwei.broadcastbestpractice.MainActivity">

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

</android.support.constraint.ConstraintLayout>
修改mainactivity.javapackage com.example.xinwei.broadcastbestpractice;

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 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 View.OnClickListener() {
         @Override
         public void onClick(View view) {
            Intent intent = new Intent("alltolove.FORCE_OFFLINE");
            sendBroadcast(intent);
         }
   });
}
}

效果图为：

页: [1]

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android programing 5.5