Android 开发功能模块总结

这是笔者在之前的 Android 开发中遇到的一些常用的模块化写法，用的还是比较多的，在这里记录一下！其实这些代码不需要去记，实在不记得了查一下就 OK 了！

获取app的版本号

private int getVersionCode() {
	PackageManager packageManager = getPackageManager();
	try {
		PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(), 0);
		int versionCode = packageInfo.versionCode;
		return versionCode;
	} catch (NameNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	return -1;
}

获取app的版本名称

private String getVersionName() {
	PackageManager packageManager = getPackageManager();
	try {
		PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(), 0);
		String versionName = packageInfo.versionName;
		return versionName;
	} catch (NameNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

	return "";
}

判断sd卡是否挂载

if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
	//如果有，则目标路径为....
	String target = Environment.getExternalStorageDirectory()+"update.apk";
}else {
	Toast.makeText(SplashActivity.this, "sd卡不存在,亲!", Toast.LENGTH_SHORT).show();
}

跳转到系统下载界面

Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addCategory(Intent.CATEGORY_DEFAULT);
intent.setDataAndType(Uri.fromFile(arg0.result),"application/vnd.android.package-archive");
startActivity(intent);

判断出当前是否有网络

//首先通过 getSystemService()方法得到了 ConnectivityManager 的实例， 这是一个系统服务类, 专门用于管理网络连接
ConnectivityManager connectionManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectionManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isAvailable()) {
	Toast.makeText(context, "network is available", Toast.LENGTH_SHORT).show();
} else {
	Toast.makeText(context, "network is unavailable", Toast.LENGTH_SHORT).show();
}

短信接收

// 如果是接收到短信
if (intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")) {
	// 取消广播（这行代码将会让系统收不到短信）
	abortBroadcast(); // 
	StringBuilder sb = new StringBuilder();
	// 接收由SMS传过来的数据
	Bundle bundle = intent.getExtras();
	// 判断是否有数据
	if (bundle != null) {
		// 通过pdus可以获得接收到的所有短信消息
		Object[] pdus = (Object[]) bundle.get("pdus");
		// 构建短信对象array,并依据收到的对象长度来创建array的大小
		SmsMessage[] messages = new SmsMessage[pdus.length];
		for (int i = 0; i < pdus.length; i++) {
			messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
		}
		// 将发送来的短信合并自定义信息于StringBuilder当中
		for (SmsMessage message : messages) {
			sb.append("短信来源:");
			// 获得接收短信的电话号码
			sb.append(message.getDisplayOriginatingAddress());
			sb.append("\n------短信内容------\n");
			// 获得短信的内容
			sb.append(message.getDisplayMessageBody());
		}
	}
	Toast.makeText(context, sb.toString(), Toast.LENGTH_LONG).show();
}

清单文件

<receiver android:name="com.lhg.smsintercept.SmsReceiver" >
        <intent-filter android:priority="100">
            <action android:name="android.provider.Telephony.SMS_RECEIVED" />
        </intent-filter>
    </receiver>

监听SD卡

//判断收到的到底是什么广播
String action = intent.getAction();
if(Intent.ACTION_MEDIA_MOUNTED.equals(action)){
	Toast.makeText(context, "SD卡可用", 0).show();
}else if(Intent.ACTION_MEDIA_UNMOUNTED.equals(action)){
	Toast.makeText(context, "sd不可用", 0).show();
}else if(Intent.ACTION_MEDIA_REMOVED.equals(action)){
	Toast.makeText(context, "sd卡已拔出	", 0).show();
}

清单文件

 <receiver android:name="com.lhg.sdlistener.SDStatusListener">
    <intent-filter >
        <action android:name="android.intent.action.MEDIA_MOUNTED"/>
        <action android:name="android.intent.action.MEDIA_REMOVED"/>
        <action android:name="android.intent.action.MEDIA_UNMOUNTED"/>
        <data android:scheme="file"/>
    </intent-filter>
 </receiver>

获取电池状态

@Override
public void onReceive(Context context, Intent intent) {
	// 获取当前电池状态信息
	String action = intent.getAction();
	if (Intent.ACTION_BATTERY_LOW.equals(action)) {
		tv_battery.setText("电池电量不足,快他妈充电去...");
	}else if (Intent.ACTION_BATTERY_CHANGED.equals(action)) {
		// (1)取得当前电量
		Bundle bundle = intent.getExtras();
		int currentLevel = bundle.getInt("level");
		// (2)取得总电量
		int total = bundle.getInt("scale");
		// (3)显示
		double persent = currentLevel * 100 / total;
		tv_battery.setText("当前电量为:" + persent + "%");
	}else if (Intent.ACTION_BATTERY_OKAY.equals(action)) {
		tv_battery.setText("电池充好了,快他妈起来嗨...");
	}
}

##监控应用程序的状态 @Override public void onReceive(Context context, Intent intent) { // TODO Auto-generated method stub String action = intent.getAction(); Uri uri = intent.getData(); if(Intent.ACTION_PACKAGE_ADDED.equals(action)){ Toast.makeText(context,uri.toString()+"被安装了", 0).show(); }else if(Intent.ACTION_PACKAGE_REPLACED.equals(action)){ Toast.makeText(context,uri.toString()+"被升级了", 0).show(); }else if(Intent.ACTION_PACKAGE_REMOVED.equals(action)){ Toast.makeText(context,uri.toString()+"被卸载了", 0).show(); } } 清单文件

<receiver android:name="com.lhg.packagelistener.AppStateReceiver">
    <intent-filter >
        <action android:name="android.intent.action.PACKAGE_ADDED"/>
        <action android:name="android.intent.action.PACKAGE_REPLACED"/>
        <action android:name="android.intent.action.PACKAGE_REMOVED"/>
        <data android:scheme="package"/>
    </intent-filter>
</receiver>

ListView 自定义 Adapter 写法

class FruitAdapter extends BaseAdapter {
	private List<String> mData;
	private LayoutInflater mInflater;
	private Context mContext;
	
	public FruitAdapater(Context context, List<String> mData){
		this.mData = mData;
		mContext = context;
		//以下方式二选一
		mInflater = LayoutInflater.from(context);
		mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	}
	@Override
	public int getCount() {
		return mData.size();
	}

	@Override
	public Object getItem(int position) {
		return mData.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		ViewHolder viewHolder = null;
		if(convertView == null){
			viewHolder = new ViewHolder();
			convertView =mInflater.inflate(ThirdActivity.this, R.layout.fruit_item, null);
			viewHolder.fruitImageId = (ImageView) convertView.findViewById(R.id.iv_photo);
			viewHolder.fruitName = (TextView) convertView.findViewById(R.id.tv_name);
			convertView.setTag(viewHolder);
		}else {
			viewHolder = (ViewHolder) convertView.getTag();
		}
		
		viewHolder.fruitImageId.setImageResource(mData.get(position).getImgId());
		viewHolder.fruitName.setText(mData.get(position).getName());
		
		return convertView;
	}
	class ViewHolder{
		ImageView fruitImageId;
		TextView fruitName;
	}
}

在对话框中加载布局(方式一)

	AlertDialog.Builder builder = new Builder(this);
	final AlertDialog dialog = builder.create();
	// 装载布局
	View dialog_view = getLayoutInflater().inflate(R.layout.add_black_number, null);
	// View dialog_view =LayoutInflater.from(this).inflate(R.layout.add_black_number, null);
	// View dialog_view = View.inflate(this, R.layout.add_black_number,null);
	//初始化控件
	Button bt_ok = (Button) dialog_view.findViewById(R.id.bt_ok);
	Button bt_cancle = (Button) dialog_view.findViewById(R.id.bt_cancel);
	//点击确定按钮
	bt_ok.setOnClickListener(new View.OnClickListener() {
		@Override
		public void onClick(View v) {
			//do something....
			dialog.dismiss();
		}
	});
	// 单击取消按钮
	bt_cancle.setOnClickListener(new View.OnClickListener() {
		@Override
		public void onClick(View v) {
			dialog.dismiss();
		}
	});
	// 让布局显示在对话框中
	dialog.setView(dialog_view, 0, 0, 0, 0);
	dialog.show();

在对话框中加载布局(方式二)

final AlertDialog dialog = new AlertDialog.Builder(this).create();
	dialog.show();//不能放在最后写，否则会报错
	Window window = dialog.getWindow();//拿到对话框所在的窗口对象
	window.setGravity(Gravity.BOTTOM);//对齐底部
	window.setContentView(R.layout.dialog);//给对话框设置布局
	Button cancelBtn = (Button) window.findViewById(R.id.camera_cancel);//或用dialog.findViewById
	cancelBtn.setOnClickListener(new OnClickListener() {
		@Override
		public void onClick(View v) {
			dialog.cancel();
		}
	});
=============================使对话框与屏幕宽度持平=============================================
    final  Dialog dialog = new Dialog(this,R.style.BottomDialog);
    dialog.show();
    dialog.setContentView(R.layout.dialog);
    dialog.setCanceledOnTouchOutside(true);// 外部点击取消
    Button btnCancel = (Button) dialog.findViewById(R.id.btn_cancel);
   
    Window window = dialog.getWindow();
    window.setWindowAnimations(R.style.AnimDialog);//对话框进出屏幕的动画
    //使对话框宽度与手机宽度持平
    WindowManager.LayoutParams params = window.getAttributes();
    params.gravity = Gravity.BOTTOM;
    params.width = WindowManager.LayoutParams.MATCH_PARENT;
    //params.height = getWindowManager().getDefaultDisplay().getHeight()*3/5;
    window.setAttributes(params);
===============================AnimDialog样式===============================================
<style name="AnimDialog" parent="@android:style/Animation">
    <item name="android:windowEnterAnimation">@anim/push_bottom_in</item>
    <item name="android:windowExitAnimation">@anim/push_bottom_out</item>
</style>

===============================BottomDialog样式=============================================
<style name="BottomDialog" parent="@style/AppTheme">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:windowIsFloating">true</item>
    <item name="android:backgroundDimEnabled">true</item>
</style>
===============================push_bottom_in=============================================
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="500"
        android:fromYDelta="100%p"
        android:toYDelta="0"
     />      
</set>
===============================push_bottom_out=============================================
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="500"
        android:fromYDelta="0"
        android:toYDelta="100%p" />
</set>
==============================dialog.xml====================================================
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/dialog"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    android:background="#D3D3D3"
    android:orientation="vertical"
    android:padding="15dp" >

    <Button
        android:id="@+id/camera_camera"
        android:layout_width="320dp"
        android:layout_height="45dp"
        android:layout_gravity="center"
        android:text="直接拍照上传"
        android:textSize="18sp" />

    <Button
        android:id="@+id/camera_phone"
        android:layout_width="320dp"
        android:layout_height="45dp"
        android:layout_gravity="center"
        android:layout_marginTop="5dp"
        android:text="从手机相片选择"
        android:textSize="18sp" />

    <Button
        android:id="@+id/camera_cancel"
        android:layout_width="320dp"
        android:layout_height="45dp"
        android:layout_gravity="center"
        android:layout_marginTop="5dp"
        android:text="取消"
        android:textColor="#ff77ff"
        android:textSize="18sp" />

</LinearLayout>

自定义控件样式

<style name="TitleSytle">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">50dp</item>
    <item name="android:background">#8866ff00</item>
    <item name="android:gravity">center</item>
    <item name="android:textColor">@color/black</item>
    <item name="android:textSize">22sp</item>
</style>

Android 进行单元测试步骤

• 在清单文件中说明，与 Application 同级

     <instrumentation
        android:name="android.test.InstrumentationTestRunner"
        android:targetPackage="com.excel.androidtestcase" >
    </instrumentation>
  

• 增加测试库，与 activity 同级

    <uses-library android:name="android.test.runner"/>
  

• 继承自 ActivityTestCase

    public class MainActivity extends ActivityTestCase {
    	public void test1() {
    		int result = Utils.add(2, 5);
    		// 断言：用来检测实际值与期望值是否一致
    		assertEquals(7, result);
    	}
    	public void test2(){
    		 Utils.divide(2, 4);
    	}
    }
  

• Utils 类说明

    public class Utils {
    	public static int add(int i, int j){
    		return i + j;
    	}			
    	public static void divide(int i, int j){
    		int result = i / j;
    	}
    }
  

待续。。。