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 -------- 判斷網絡狀態-----------------------------
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("沒有可用的網絡")
.setMessage("是否對網絡進行設置？");
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 ----------調節屏幕亮度-------
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--------檢查手機是否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 --------------殺死當前進程--------------------------
public static void killProc()
{
android.os.Process.killProcess(android.os.Process.myPid());
System.exit(0);
}
6 ----------防止快速點擊按鈕----------------
public static boolean isFastDoubleClick()
{
long time = System.currentTimeMillis();
long timeX = time - lastClickTime;
if (0 < timeX && timeX < 500)
{
return true;
}
lastClickTime = time;
return false;
}