android 自己总结的小工具类-优快云博客

本文汇总了多个Android开发中常用的工具方法，包括dp与px单位转换、网络状态判断、屏幕亮度调节、检查设备是否root、杀死当前进程及防止按钮快速重复点击等功能。

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1 dp 与 px 的相互转换

public class DensityUtil {

public static int dip2px(Context context, float dpValue) {

final float scale = context.getResources().getDisplayMetrics().density;

return (int) (dpValue * scale + 0.5f);

}

public static int px2dip(Context context, float pxValue) {

final float scale = context.getResources().getDisplayMetrics().density;

return (int) (pxValue / scale + 0.5f);

}

2 -------- 判断网络状态-----------------------------

android:name="android.permission.ACCESS_NETWORK_STATE" />

private boolean getNetWorkStatus() {

boolean netSataus = false;

ConnectivityManager cwjManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

cwjManager.getActiveNetworkInfo();

if (cwjManager.getActiveNetworkInfo() != null) {

netSataus = cwjManager.getActiveNetworkInfo().isAvailable();

}

if (!netSataus) {

Builder b = new AlertDialog.Builder(this).setTitle("没有可用的网络")

.setMessage("是否对网络进行设置？");

b.setPositiveButton("是", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

Intent mIntent = new Intent("/");

ComponentName comp = new ComponentName(

"com.android.settings",

"com.android.settings.WirelessSettings");

mIntent.setComponent(comp);

mIntent.setAction("android.intent.action.VIEW");

startActivityForResult(mIntent,0);

}

}).setNeutralButton("否", new DialogInterface.OnClickListener() {

public void onClick(DialogInterface dialog, int whichButton) {

dialog.cancel();

}

}).show();

}

return netSataus;

}

3 ----------调节屏幕亮度-------

public void setBrightness(int level) {

ContentResolver cr = getContentResolver();

Settings.System.putInt(cr, "screen_brightness", level);

Window window = getWindow();

LayoutParams attributes = window.getAttributes();

float flevel = level;

attributes.screenBrightness = flevel / 255;

getWindow().setAttributes(attributes);

}

4--------检查手机是否root ---------------------

public static boolean checkRootingState(Context context)

{

final String ROOT_PATH = Environment.getExternalStorageDirectory() + "";

final String ROOTING_PATH_1 = "/system/bin/su";

final String ROOTING_PATH_2 = "/system/xbin/su";

final String ROOTING_PATH_3 = "/system/app/SuperUser.apk";

final String ROOTING_PATH_4 = context.getFilesDir().getPath() + "data/com.noshufou.android.su";

// System.out.println("1111111111111111111 " + ROOTING_PATH_4);

String[] rootFilesPath = new String[] { ROOT_PATH + ROOTING_PATH_1, ROOT_PATH + ROOTING_PATH_2,

ROOT_PATH + ROOTING_PATH_3, ROOT_PATH + ROOTING_PATH_4 };

boolean isRootingFlag = false;

try

{

Runtime.getRuntime().exec("su");

isRootingFlag = true;

} catch (Exception e)

{

isRootingFlag = false;

}

if (!isRootingFlag)

{

isRootingFlag = checkRootingFiles(createFiles(rootFilesPath));

}

return isRootingFlag;

}

5 --------------杀死当前进程--------------------------

public static void killProc()

{

android.os.Process.killProcess(android.os.Process.myPid());

System.exit(0);

}

6 ----------防止快速点击按钮----------------

public static boolean isFastDoubleClick()

{

long time = System.currentTimeMillis();

long timeX = time - lastClickTime;

if (0 < timeX && timeX < 500)

{

return true;

}

lastClickTime = time;

return false;

}