2019獨角獸企業重金招聘Python工程師標準>>>

1、 精確獲取屏幕尺寸（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);double diagonalPixels = Math.sqrt(Math.pow(dm.widthPixels, 2) + Math.pow(dm.heightPixels, 2));return diagonalPixels / (160 * dm.density);}

2、? 判斷是否是平板（官方用法）

public static boolean isTablet(Context context) {return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE;}

3、? 文字根據狀態更改顏色 android:textColor(放在res/color/目錄下)

<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:color="#53c1bd" android:state_selected="true"/><item android:color="#53c1bd" android:state_focused="true"/><item android:color="#53c1bd" android:state_pressed="true"/><item android:color="#777777"/> </selector>

?4、背景色根據狀態更改顏色 android:backgroup(如果直接給背景色color會報錯)

<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_selected="true"><shape><gradient android:angle="0" android:centerColor="#00a59f" android:endColor="#00a59f" android:startColor="#00a59f" /></shape></item><item android:state_focused="true"><shape><gradient android:angle="0" android:centerColor="#00a59f" android:endColor="#00a59f" android:startColor="#00a59f" /></shape></item><item android:state_pressed="true"><shape><gradient android:angle="0" android:centerColor="#00a59f" android:endColor="#00a59f" android:startColor="#00a59f" /></shape></item><item><shape><gradient android:angle="0" android:centerColor="#00ff00" android:endColor="00ff00" android:startColor="00ff00" /></shape></item></selector>

5、? 啟動APK的默認Activity

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public static void startApkActivity(final Context ctx, String packageName) {PackageManager pm = ctx.getPackageManager();PackageInfo pi;try {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);}}

7、計算字寬

public static float GetTextWidth(String text, float Size) {TextPaint FontPaint = new TextPaint();FontPaint.setTextSize(Size);return FontPaint.measureText(text);}

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轉載于:https://my.oschina.net/luozheng/blog/113309

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