第4.3节_Android硬件访问服务编写APP代码

源码下载方法
    
    第一次:
    git clone https://github.com/weidongshan/APP_0001_LEDDemo.git
    
    更新:
    git pull origin
    
    取出指定版本:
    git checkout v7  // 使用硬件访问服务

3 编写APP代码
a. 包含什么
out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/classes.jar

How do I build the Android SDK with hidden and internal APIs available?
http://stackoverflow.com/questions/7888191/how-do-i-build-the-android-sdk-with-hidden-and-internal-apis-available

 File--------------------->Project Strucure---------------------------------->+

 
b. 怎么包含
Creating a module library and adding it to module dependencies
https://www.jetbrains.com/idea/help/configuring-module-dependencies-and-libraries.html

E:Githubhello-worldAPP_0001_LEDDemoappuild.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.thisway.app_0001_leddemo"
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"

        // Enabling multidex support.
        multiDexEnabled true
    }

    dexOptions {
        javaMaxHeapSize "4g"
    }
    sourceSets {
        main {
            jniLibs.srcDirs = ['libs']
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.2.1'
    compile project(':classes')
    compile 'com.android.support:multidex:1.0.0'

}

 E:Githubhello-worldAPP_0001_LEDDemoappsrcmainAndroidManifest.xml

  android:name="android.support.multidex.MultiDexApplication"

 E:Githubhello-worldAPP_0001_LEDDemoappsrcmainjavacom hiswayapp_0001_leddemoMainActivity.java

package com.thisway.app_0001_leddemo;

import android.os.RemoteException;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.view.View;
import android.widget.CheckBox;
import android.widget.Toast;
import android.os.ILedService;
import android.os.ServiceManager;

public class MainActivity extends AppCompatActivity {

    private boolean ledon = false;
    private Button button = null;
    private CheckBox checkBoxLed1 = null;
    private CheckBox checkBoxLed2 = null;
    private CheckBox checkBoxLed3 = null;
    private CheckBox checkBoxLed4 = null;
    private ILedService iLedService = null;

    class MyButtonListener implements View.OnClickListener {
        @Override
        public void onClick(View v) {
            ledon = !ledon;
            if (ledon) {
                button.setText("ALL OFF");
                checkBoxLed1.setChecked(true);
                checkBoxLed2.setChecked(true);
                checkBoxLed3.setChecked(true);
                checkBoxLed4.setChecked(true);

                try {
                    for (int i = 0; i < 4; i++)
                        iLedService.ledCtrl(i, 1);
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
            }
            else {
                button.setText("ALL ON");
                checkBoxLed1.setChecked(false);
                checkBoxLed2.setChecked(false);
                checkBoxLed3.setChecked(false);
                checkBoxLed4.setChecked(false);

                try {
                    for (int i = 0; i < 4; i++)
                        iLedService.ledCtrl(i, 0);
                } catch (RemoteException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public void onCheckboxClicked(View view) {
        // Is the view now checked?
        boolean checked = ((CheckBox) view).isChecked();

        try {
            // Check which checkbox was clicked
            switch(view.getId()) {
                case R.id.LED1:
                    if (checked) {
                        // Put some meat on the sandwich
                        Toast.makeText(getApplicationContext(), "LED1 on", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(0, 1);
                    }
                    else {
                        // Remove the meat
                        Toast.makeText(getApplicationContext(), "LED1 off", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(0, 0);
                    }
                    break;
                case R.id.LED2:
                    if (checked) {
                        // Put some meat on the sandwich
                        Toast.makeText(getApplicationContext(), "LED2 on", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(1, 1);
                    }
                    else {
                        // Remove the meat
                        Toast.makeText(getApplicationContext(), "LED2 off", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(1, 0);
                    }
                    break;

                case R.id.LED3:
                    if (checked) {
                        // Put some meat on the sandwich
                        Toast.makeText(getApplicationContext(), "LED3 on", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(2, 1);
                    }
                    else {
                        // Remove the meat
                        Toast.makeText(getApplicationContext(), "LED3 off", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(2, 0);
                    }
                    break;

                case R.id.LED4:
                    if (checked) {
                        // Put some meat on the sandwich
                        Toast.makeText(getApplicationContext(), "LED4 on", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(3, 1);
                    }
                    else {
                        // Remove the meat
                        Toast.makeText(getApplicationContext(), "LED4 off", Toast.LENGTH_SHORT).show();
                        iLedService.ledCtrl(3, 0);
                    }
                    break;
                // TODO: Veggie sandwich
            }
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.BUTTON);

        iLedService = ILedService.Stub.asInterface(ServiceManager.getService("led"));
        
        checkBoxLed1 = (CheckBox) findViewById(R.id.LED1);
        checkBoxLed2 = (CheckBox) findViewById(R.id.LED2);
        checkBoxLed3 = (CheckBox) findViewById(R.id.LED3);
        checkBoxLed4 = (CheckBox) findViewById(R.id.LED4);

        button.setOnClickListener(new MyButtonListener());
/*
        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                // Perform action on click
                ledon = !ledon;
                if (ledon)
                    button.setText("ALL OFF");
                else
                    button.setText("ALL ON");
            }
        });
*/
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

编译错误
a. java.lang.OutOfMemoryError: GC overhead limit exceeded

Android Studio Google jar causing GC overhead limit exceeded error
http://stackoverflow.com/questions/25013638/android-studio-google-jar-causing-gc-overhead-limit-exceeded-error

b. Too many field references

Building Apps with Over 65K Methods
https://developer.android.com/tools/building/multidex.html