两个进程之间的通信

最新推荐文章于 2024-04-03 11:16:22 发布

Gentleman-czx

最新推荐文章于 2024-04-03 11:16:22 发布

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分类专栏： android-studio 文章标签：进程通信

本文链接：https://blog.youkuaiyun.com/Gentenman_czx/article/details/78561973

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本文介绍了一个简单的App间通信示例，通过创建客户端和服务端两个应用实现加法计算功能。使用AIDL进行进程间通信，并提供了完整的代码实现。

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下面写一下我做的一个两个App进程之间的通信方式，用一个简单的例子来体现

相当于一个加法计算器：

首先这里需要创建两个modle,一个是客户端App，一个是服务端App

这里用的是dataBinding的写法，所以需要在grid中写个配置

还有一个自己封装的工具包：

TypeCast:

public class TypeCast {

    public static final String TAG = "TypeCast";

    /**
     * Convert Object to Integer
     * 注：
     * TypeCast.toInt(null, -1)); // Return：-1，Not：0
     * TypeCast.toInt("", -1)); // Return：-1，Not：0
     *
     * @param value        a Object
     * @param defaultValue Value to return if value is null、empty or convert failure.
     * @return Returns the converted value if it exists, or defaultValue
     */
    public static int toInt(Object value, int defaultValue) {
        if (value == null) {
            return defaultValue;
        }

        try {
            return Integer.valueOf(value.toString());
        } catch (NumberFormatException e1) {
//            Log.e(TAG, "toInt() Convert String to Integer, defaultValue: " + defaultValue, e1);
            try {
                return Double.valueOf(value.toString()).intValue();
            } catch (NumberFormatException e2) {
//                Log.e(TAG, "toInt() Convert String to Double, defaultValue: " + defaultValue, e2);
                return defaultValue;
            }
        }
    }

    /**
     * Convert Object to Long
     * 注：
     * TypeCast.toLong(null, -1)); // Return：-1，Not：0
     * TypeCast.toLong("", -1)); // Return：-1，Not：0
     *
     * @param value        a Object
     * @param defaultValue Value to return if value is null、empty or convert failure.
     * @return Returns the converted value if it exists, or defaultValue
     */
    public static long toLong(Object value, long defaultValue) {
        if (value == null) {
            return defaultValue;
        }

        try {
            return Long.valueOf(value.toString());
        } catch (NumberFormatException e1) {
//            Logger.e(TAG, "toLong() Convert String to Long, defaultValue: " + defaultValue, e1);
            try {
                return Double.valueOf(value.toString()).longValue();
            } catch (NumberFormatException e2) {
//                Logger.e(TAG, "toLong() Convert String to Double, defaultValue: " + defaultValue, e2);
                return defaultValue;
            }
        }
    }

    /**
     * Convert Object to Float
     * 注：
     * TypeCast.toFloat(null, -1.0f)); // Return：-1.0f，Not：0
     * TypeCast.toFloat("", -1.0f)); // Return：-1.0f，Not：0
     *
     * @param value        a Object
     * @param defaultValue Value to return if value is null、empty or convert failure.
     * @return Returns the converted value if it exists, or defaultValue
     */
    public static float toFloat(Object value, float defaultValue) {
        if (value == null) {
            return defaultValue;
        }

        try {
            return Float.valueOf(value.toString());
        } catch (NumberFormatException e) {
//            Logger.e(TAG, "toFloat() Convert String to Float, defaultValue: " + defaultValue, e);
            return defaultValue;
        }
    }

    /**
     * Convert Object to Double
     * 注：
     * TypeCast.toDouble(null, -1.0)); // Return：-1.0，Not：0
     * TypeCast.toDouble("", -1.0)); // Return：-1.0，Not：0
     *
     * @param value        a Object
     * @param defaultValue Value to return if value is null、empty or convert failure.
     * @return Returns the converted value if it exists, or defaultValue
     */
    public static double toDouble(Object value, double defaultValue) {
        if (value == null) {
            return defaultValue;
        }

        try {
            return Double.valueOf(value.toString());
        } catch (NumberFormatException e) {
//            Logger.e(TAG, "toDouble() Convert String to Double, defaultValue: " + defaultValue, e);
            return defaultValue;
        }
    }

}

客户端：

在这里先把values的东西写上：

colors:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
</resources>

dimens:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="wrapper_vertical_margin">16dp</dimen>
    <dimen name="wrapper_horizontal_margin">16dp</dimen>
    <dimen name="line_height">64dp</dimen>
</resources>

strings:

<resources>
    <string name="app_name">CalculatorClient</string>

    <string name="calculator_button">求和计算</string>
    <string name="calculator_result_label">结果：</string>
    <string name="calculator_result">0</string>
    <string name="calculator_num1_label">Num1：</string>
    <string name="calculator_num2_label">Num2：</string>
</resources>

styles:

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="calculator_wrapper">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">@dimen/line_height</item>
        <item name="android:orientation">horizontal</item>
    </style>

    <style name="calculator_label">
        <item name="android:layout_width">0dp</item>
        <item name="android:layout_height">match_parent</item>
        <item name="android:layout_weight">3</item>
        <item name="android:gravity">center_vertical|end</item>
        <item name="android:paddingBottom">@dimen/wrapper_vertical_margin</item>
        <item name="android:paddingLeft">@dimen/wrapper_horizontal_margin</item>
        <item name="android:paddingRight">@dimen/wrapper_horizontal_margin</item>
        <item name="android:paddingTop">@dimen/wrapper_vertical_margin</item>
        <item name="android:textSize">24sp</item>
    </style>

    <style name="calculator_value">
        <item name="android:layout_width">0dp</item>
        <item name="android:layout_height">match_parent</item>
        <item name="android:layout_weight">5</item>
        <item name="android:gravity">center_vertical</item>
        <item name="android:paddingBottom">@dimen/wrapper_vertical_margin</item>
        <item name="android:paddingLeft">@dimen/wrapper_horizontal_margin</item>
        <item name="android:paddingRight">@dimen/wrapper_horizontal_margin</item>
        <item name="android:paddingTop">@dimen/wrapper_vertical_margin</item>
        <item name="android:textSize">24sp</item>
        <item name="android:inputType">number</item>
    </style>

    <style name="calculator_button">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">@dimen/line_height</item>
        <item name="android:text">@string/calculator_button</item>
        <item name="android:textSize">24sp</item>
    </style>

</resources>

主界面的 xml

import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;

import com.bwei.czx.service.IMyAidlInterface;
import com.bwei.czx.service33.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
    ActivityMainBinding mainBinding;
    IMyAidlInterface mInterface;
    ServiceConnection mConn = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            mInterface = IMyAidlInterface.Stub.asInterface(iBinder);
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mInterface = null;
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);

        Intent intent = new Intent();

	//这里写服务类的包名和包名.类名
        intent.setComponent(new ComponentName("com.czx.service","com.czx.service.CalculatorService"));
        bindService(intent,mConn, Service.BIND_AUTO_CREATE);

        mainBinding.calculatorButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int num1 = TypeCast.toInt(mainBinding.etNum1.getText().toString(),0);
                int num2 = TypeCast.toInt(mainBinding.etNum2.getText().toString(),0);
                Log.i("=======","num1="+num1+"num2="+num2);
                try {
                    if(mInterface != null){
                        int result = mInterface.add(num1,num2);
                        mainBinding.tvResult.setText(String.valueOf(result));
                    }
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
            }
        });
    }

    @Override
    protected void onDestroy() {
        if(mInterface != null){
            unbindService(mConn);
        }
        super.onDestroy();
    }
}

MainActivity中：

import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;

import com.bwei.czx.service.IMyAidlInterface;
import com.bwei.czx.service33.databinding.ActivityMainBinding;

public class MainActivity extends AppCompatActivity {
    ActivityMainBinding mainBinding;
    IMyAidlInterface mInterface;

    ServiceConnection mConn = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            mInterface = IMyAidlInterface.Stub.asInterface(iBinder);
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mInterface = null;
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);

        Intent intent = new Intent();
        //输入包名，第二个输入包名.服务端那边的服务名
        intent.setComponent(new ComponentName("com.bwei.czx.service","com.bwei.czx.service.CalculatorService"));
        bindService(intent,mConn, Service.BIND_AUTO_CREATE);

        mainBinding.calculatorButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int num1 = TypeCast.toInt(mainBinding.etNum1.getText().toString(),0);
                int num2 = TypeCast.toInt(mainBinding.etNum2.getText().toString(),0);
                Log.i("=======","num1="+num1+"num2="+num2);
                try {
                    //防御性判断
                    if(mInterface != null){
                        int result = mInterface.add(num1,num2);
                        mainBinding.tvResult.setText(String.valueOf(result));
                    }
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
            }
        });
    }

    @Override
    protected void onDestroy() {
        if(mInterface != null){
            unbindService(mConn);
        }
        super.onDestroy();
    }
}

服务端：

CalculatorService

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;

public class CalculatorService extends Service {
    private IBinder mBinder = new IMyAidlInterface.Stub() {
        @Override
        public int add(int num1, int num2) throws RemoteException {
            return num1 + num2;
        }
    };
    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }
}

然后在服务端创建一个aidl

interface IMyAidlInterface {
    int add(int num1,int num2);
}

之后把服务端创建的aidl复制，粘贴到客户端里面。

写完就可以运行了。