Android进阶之路

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本篇学于郭霖大神的第二行代码，加以理解敲出自己的篇章

采用的是Android中的广播机制，如果大家不理解广播的使用的话，可以通过以下地址进行学习（可以比较全面的理解和使用）

http://blog.csdn.net/qq_20451879/article/details/54317383

Effect ：

这里写图片描述

前三步为准备动作，后面实现只是常规使用

正确账号：123正确密码：123

AndroidMainfest（进入初始Activity设置）：

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.dow.accountintercept">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/Theme.AppCompat.Light.NoActionBar">        <activity android:name=".LoginActivity"            android:launchMode="singleTask"            >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".MainActivity"            android:launchMode="singleTask"            />    </application></manifest>

一：

ActivityCollector（采用的郭神的工具类）：

package com.example.dow.accountintercept;import android.app.Activity;import java.util.ArrayList;import java.util.List;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();            }`        }    }}

二：

BaseActivity ：

package com.example.dow.accountintercept;import android.content.IntentFilter;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;public class BaseActivity extends AppCompatActivity {    private AccoutReceiver receiver;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        ActivityCollector.addActivity(this);    }    @Override    protected void onResume() {        super.onResume();        IntentFilter intentFilter = new IntentFilter("ForcedDownline");        receiver = new AccoutReceiver();        registerReceiver(receiver,intentFilter);    }    @Override    protected void onPause() {        super.onPause();        if(receiver != null){            unregisterReceiver(receiver);            receiver = null;        }    }    @Override    protected void onDestroy() {        super.onDestroy();        ActivityCollector.removeActivity(this);    }}

三：

AccountReceiver ：

package com.example.dow.accountintercept;import android.app.AlertDialog;import android.content.BroadcastReceiver;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;public class AccoutReceiver extends BroadcastReceiver {    @Override    public void onReceive(final Context context, Intent intent) {        AlertDialog.Builder dialog = new AlertDialog.Builder(context);        dialog.setTitle("警告");        dialog.setMessage("强制下线，请重新登陆");        dialog.setCancelable(false);        dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                ActivityCollector.finishAll();                context.startActivity(new Intent(context,LoginActivity.class));            }        });            dialog.show();    }}

MainActivity ：

package com.example.dow.accountintercept;import android.content.Intent;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends BaseActivity {    private TextView mBtn;    @Override    public  void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        init();    }    private void init() {        mBtn = (TextView) findViewById(R.id.tv_btn);        //在事件处理的内部进行发送广播        mBtn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent("ForcedDownline");                sendBroadcast(intent);            }        });    }}

LoginActivity ：

package com.example.dow.accountintercept;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class LoginActivity extends BaseActivity {    private EditText mAccount;    private EditText mPassword;    private TextView mLogin;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_login);        initView();        initData();    }    private void initView() {        mAccount = (EditText) findViewById(R.id.ed_account);        mPassword = (EditText) findViewById(R.id.ed_password);        mLogin = (TextView) findViewById(R.id.tv_login);    }    private void initData() {        mLogin.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                String eAccount=mAccount.getText().toString();                String ePassword= mPassword.getText().toString();                if(eAccount.equals("123")&&ePassword.equals("123")){                    startActivity(new Intent(LoginActivity.this,MainActivity.class));                    finish();                }else{                    Toast.makeText(LoginActivity.this,"用户密码错误，请您重新输入",Toast.LENGTH_LONG).show();                }            }        });    }}

MainActivity Xml：

<?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:id="@+id/activity_main"    android:orientation="vertical"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.dow.accountintercept.MainActivity">    <TextView        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1"        android:gravity="center"        android:text="登陆成功，这里是主界面" />    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="5dp"        android:text="强制下线"        android:layout_gravity="center"        android:background="#f00"        android:textColor="#fff"        android:id="@+id/tv_btn"        android:layout_marginBottom="30dp"        /></LinearLayout>

LoginActivity Xml ：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:orientation="vertical"    android:layout_height="match_parent">    <LinearLayout        android:layout_marginTop="150dp"        android:layout_marginLeft="10dp"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        >        <TextView            android:text="账户："            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <EditText            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:id="@+id/ed_account"/>    </LinearLayout>    <LinearLayout        android:layout_marginLeft="10dp"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="horizontal"        >        <TextView            android:text="密码："            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <EditText            android:layout_width="0dp"            android:layout_weight="1"            android:layout_height="wrap_content"            android:id="@+id/ed_password"/>    </LinearLayout>    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="10dp"        android:text="登陆"        android:id="@+id/tv_login"        android:textColor="#fff"        android:background="#3F51B5"        android:layout_gravity="center"        /></LinearLayout>

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