也可以在manifest中:
- requestWindowFeature(Window.FEATURE_NO_TITLE); // 无标题栏需要在setContentView之前
- getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
- 横屏
- >setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 安装apk
- private void install(File file) {
- Intent intent = new Intent();
- intent.setAction(Intent.ACTION_VIEW);
- // intent.setData(Uri.fromFile(file));
- // intent.setType("application/vnd.android.package-archive"); //mime的数据类型 plain/text image/jpeg
- intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");//该mime 表示 .apk 文件类型
- startActivity(intent);
- } 精确获取屏幕尺寸(例如:3.5、4.0、5.0寸屏幕)
- public static double getScreenPhysicalSize(Activity ctx) {
- DisplayMetrics dm = new DisplayMetrics();
- ctx.getWindowManager().getDefaultDisplay().getMetrics(dm);
- //对角线像素长
- double diagonalPixels = Math.sqrt(Math.pow(dm.widthPixels, 2) + Math.pow(dm.heightPixels, 2));
- return diagonalPixels / (160 * dm.density); //160像素,density=1
- }
- 启动Apk的默认Activity
- public static void startApkActivity(final Context ctx, String packageName) {
- PackageManager pm = ctx.getPackageManager();
- PackageInfo pi;
- try {
- <span style="white-space:pre"> </span>pi = pm.getPackageInfo(packageName, 0);
- Intent intent = new Intent(Intent.ACTION_MAIN, null);
- intent.addCategory(Intent.CATEGORY_LAUNCHER);
- intent.setPackage(pi.packageName);
- List<ResolveInfo> apps = pm.queryIntentActivities(intent, 0);
- ResolveInfo ri = apps.iterator().next();
- if (ri != null) {
- String className = ri.activityInfo.name;
- intent.setComponent(new ComponentName(packageName, className));
- ctx.startActivity(intent);
- }
- } catch (NameNotFoundException e) {
- Log.e("startActivity", e.getMessage());
- }
- }
- 根据手机的分辨率从 dp 的单位 转成为 px(像素)
- public static int dip2px(Context context, float dpValue) {
- final float scale = context.getResources().getDisplayMetrics().density;
- return (int) (dpValue * scale + 0.5f);
- }
- 根据手机的分辨率从 px(像素) 的单位 转成为dp
- public static int px2dip(Context context, float pxValue) {
- <span style="white-space:pre"> </span>final float scale = context.getResources().getDisplayMetrics().density;
- return (int) (pxValue / scale + 0.5f);
- } 重启应用程序
- Intent i = getBaseContext().getPackageManager()//
- .getLaunchIntentForPackage(getBaseContext().getPackageName());
- i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
- startActivity(i);
- 判断字宽
- public static float GetTextWidth(String text, float size) {
- TextPaint fontPaint = new TextPaint();
- fontPaint.setTextSize(size);
- return fontPaint.measureText(text);
- }
来源: http://www.phpxs.com/code/1002004/