Share a few Android development useful program code

[webview loads local html, html and remote URL]

//  Open this package asset In the directory index.html file 

wView.loadUrl("file:///android_asset/index.html ");

//  Open the local sd Inside the card index.html file 

wView.loadUrl("content://com.android.htmlfileprovider/sdcard/index.html");

//  Open the specified URL the html file 

wView.loadUrl("http://m.xxx.net");

[Get screen resolution]

//  through WindowManager To obtain   

DisplayMetrics dm = new DisplayMetrics();  

getWindowManager().getDefaultDisplay().getMetrics(dm);  

System.out.println("heigth : " + dm.heightPixels);  

System.out.println("width : " + dm.widthPixels);  

//  through Resources To obtain           

DisplayMetrics dm2 = getResources().getDisplayMetrics();  

System.out.println("heigth2 : " + dm2.heightPixels);  

System.out.println("width2 : " + dm2.widthPixels);    

//  Gets the default resolution of the screen   

Display display = getWindowManager().getDefaultDisplay();  

System.out.println("width-display :" + display.getWidth());  

System.out.println("heigth-display :" + display.getHeight());

//  through WindowManager To obtain 

DisplayMetrics dm = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(dm);

System.out.println("heigth : " + dm.heightPixels);

System.out.println("width : " + dm.widthPixels);

//  through Resources To obtain  

DisplayMetrics dm2 = getResources().getDisplayMetrics();

System.out.println("heigth2 : " + dm2.heightPixels);

System.out.println("width2 : " + dm2.widthPixels);

//  Gets the default resolution of the screen 

Display display = getWindowManager().getDefaultDisplay();

System.out.println("width-display :" + display.getWidth());

System.out.println("heigth-display :" + display.getHeight());

[Remove screen title and full screen display]

//  Get rid of the title   

requestWindowFeature(Window.FEATURE_NO_TITLE);

//  Set up the full screen 

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  WindowManager.LayoutParams.FLAG_FULLSCREEN);

//  Get rid of the title 

requestWindowFeature(Window.FEATURE_NO_TITLE);

//  Set up the full screen 

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

[Setting screen direction]

Configure the properties of Activity in the Manifest.xml file

<activity android:name=".AnimateActivity" android:label="@string/app_name" 

    android:screenOrientation="landscape"><!-- landscape  landscape portrait  Vertical screen  --> 

    <intent-filter> 

        <action android:name="android.intent.action.MAIN" /> 

        <category android:name="android.intent.category.LAUNCHER" /> 

    </intent-filter> 

</activity>

In the program control,1 generally in Activity onCreate, onDestroy methods, because the system will restart Activity when the screen direction changes. Therefore, it is necessary to save relevant data before Activity is destroyed to facilitate reloading in the next onCreate method and update the layout of the screen

public void onCreate(Bundle savedInstanceState) {  

    // Mandatory landscape   

    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);  

    // TODO  Update screen layout   

}

public void onDestroy() {  

    if(getRequestedOrientation() ==  ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) { 

        //  Save the data   

    }else if(getRequestedOrientation() ==  ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { 

        //  Save the data   

    }  

}

[Access to memory card path and space usage]

//  Gets the memory card path 

File sdcardDir = Environment.getExternalStorageDirectory();

// StatFs Look at the file system space usage  

File sdcardDir = Environment.getExternalStorageDirectory();

StatFs statFs = new StatFs(sdcardDir.getPath());

// Block  the  size 

File sdcardDir = Environment.getExternalStorageDirectory();

StatFs statFs = new StatFs(sdcardDir.getPath());

Long blockSize = statFs.getBlockSize();

//  The total  Block  The number of  

File sdcardDir = Environment.getExternalStorageDirectory();

StatFs statFs = new StatFs(sdcardDir.getPath());

Long totalBlocks = statFs.getBlockCount();

//  Has been used  Block  The number of  

File sdcardDir = Environment.getExternalStorageDirectory();

StatFs statFs = new StatFs(sdcardDir.getPath());

Long availableBlocks = statFs.getAvailableBlocks();

[Soft keyboard for Android control]

InputMethodManager inputMethodManager=(InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

inputMethodManager.toggleSoftInput(0, InputMethodManager.HIDE_NOT_ALWAYS);

[Access to mobile phone number]

Remember to add permissions to manifest file

<uses-permission  android:name="android.permission.READ_PHONE_STATE" />

//  Create a call manager to establish a connection with the phone 

TelephonyManager tm = (TelephonyManager)activity.getSystemService(Context.TELEPHONY_SERVICE);

//  Access to cell phone number 

String phoneId = tm.getLine1Number();