001.判断当前横竖屏，设置横竖屏
if(this.getResources().getConfiguration().orientation ==Configuration.ORIENTATION_PORTRAIT){
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
}
002.获取DisplayMetrics成员，获得屏幕分辨率，dp和px转换
DisplayMetrics metrics ＝ new DisplayMetrics();
WindowManager WM = (WindowManager)mcontext.getSystemService(Context.WINDOW_SERVICE);
WM.getDefaultDisplay().getMetrics(metrics);
float sPixelDensity = metrics.density;//逻辑分辨率
int width = metrics.widthPixels() ;//宽
int height = metrics.heightPixels();//高
public static float dpToPixel(float dp) {
return sPixelDensity * dp;
}
public static int dpToPixel(int dp) {
return Math.round(dpToPixel((float) dp));
}
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density ;
return (int) (pxValue / scale + 0.5f) ;
}
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density ;
return (int) (dpValue * scale + 0.5f) ;
}
public static int meterToPixel(float meter) {
// 1 meter = 39.37 inches, 1 inch = 160 dp.
return Math.round(dpToPixel(meter * 39.37f * 160));
}
003.判断是否是平板（官方用法）public static boolean isTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) >= Configuration.SCREENLAYOUT_SIZE_LARGE;
}
004.文字根据状态更改颜色 android:textColor <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>
005.按钮根据状态更改背景图片
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Non focused states -->
<item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/fake_actionbar_ic_callout_normal" />
<item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/fake_actionbar_ic_callout_normal" />
<!-- Focused states -->
<item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/fake_actionbar_ic_callout_normal" />
<item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/fake_actionbar_ic_callout_normal" />
<!-- Pressed -->
<!-- Non focused states -->
<item android:state_focused="false" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/fake_actionbar_ic_callout_press" />
<item android:state_focused="false" android:state_selected="true" android:state_pressed="true" android:drawable="@drawable/fake_actionbar_ic_callout_press" />
<!-- Focused states -->
<item android:state_focused="true" android:state_selected="false" android:state_pressed="true" android:drawable="@drawable/fake_actionbar_ic_callout_press" />
<item android:state_focused="true" android:state_selected="true" android:state_pressed="true" android:drawable="@drawable/fake_actionbar_ic_callout_press" />
</selector>
006.带边框图片
[size=14.399999618530273px]<?xml version="1.0" encoding="UTF-8"?>[size=14.399999618530273px]
[size=14.399999618530273px]2 <shape xmlns:android="[size=14.399999618530273px]http://schemas.android.com/apk/res/android[size=14.399999618530273px]">
[size=14.399999618530273px]3 <solid android:color="#EEEEEE" />
[size=14.399999618530273px]4 <stroke android:width="3dp" android:color="#EEEEEE" />
[size=14.399999618530273px]5 <corners android:radius="0dp" />
[size=14.399999618530273px]6 <padding android:left="0dp" android:top="0dp" android:right="0dp" android:bottom="0dp" />
[size=14.399999618530273px]7 </shape>
[size=14.399999618530273px]在Imageview定义页面上使用代码：
[size=14.399999618530273px][代码]xml代码：
[size=14.399999618530273px]1 ImageView
[size=14.399999618530273px]2 android:id="@+id/iv_thumbnail"
[size=14.399999618530273px]3 android:layout_height="63dp"
[size=14.399999618530273px]4 android:layout_width="63dp"
[size=14.399999618530273px]5 android:background="@drawable/bg_border1"
[size=14.399999618530273px]6 android:padding="3dp"
[size=14.399999618530273px]7 />
007.监听SD卡插拔
BroadcastReceiver mSDCardMountEventReceiver;
private void registerExternalStorageListener() {
if (mSDCardMountEventReceiver == null) {
mSDCardMountEventReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_MEDIA_EJECT)) {
} else if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {
}
}
};
IntentFilter iFilter = new IntentFilter();
iFilter.addAction(Intent.ACTION_MEDIA_EJECT);
iFilter.addAction(Intent.ACTION_MEDIA_MOUNTED);
iFilter.addDataScheme("file");
registerReceiver(mSDCardMountEventReceiver, iFilter);
}
}
008.fragment嵌套fragment final FragmentTransaction ft = getChildFragmentManager().beginTransaction();
ft.add(R.id.call_log, mCallLogFragment);
ft.commit();
009.取消标题和状态栏
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
android:theme="@android:style/Theme.NoTitleBar"
[size=14.399999618530273px]android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
[size=14.399999618530273px]010.创建对话框
[size=14.399999618530273px] public void createDialog(){
[size=14.399999618530273px] Builder builder = new AlertDialog.Builder(this); [size=14.399999618530273px]
[size=14.399999618530273px] builder.setTitle(R.string.xxx);
[size=14.399999618530273px] builder.setMessage(message); [size=14.399999618530273px]
[size=14.399999618530273px] builder.setIcon(R.drawable.ic_launcher);
[size=14.399999618530273px] builder.setPositiveButton("确定", new DialogInterface.OnClickListener(){ [size=14.399999618530273px]
[size=14.399999618530273px] @Override
[size=14.399999618530273px] public void onClick(DialogInterface dialog, int which){ [size=14.399999618530273px]
[size=14.399999618530273px] }
[size=14.399999618530273px] }).setNegativeButton("取消", new DialogInterface.OnClickListener(){ [size=14.399999618530273px]
[size=14.399999618530273px] @Override
[size=14.399999618530273px] public void onClick(DialogInterface dialog, int which){ [size=14.399999618530273px]
[size=14.399999618530273px] }
[size=14.399999618530273px] }).create(); [size=14.399999618530273px]
[size=14.399999618530273px] builder.show(); [size=14.399999618530273px]
[size=14.399999618530273px] }
[size=14.399999618530273px]011.判断是否联网
private void judgeNetwork() {
/*
* The primary responsibilities of this class(ConnectivityManager) are
* to:
* 1.Monitor network connections (Wi-Fi, GPRS, UMTS, etc.)
* 2.Send broadcast intents when network connectivity changes
* 3.Attempt to "fail over" to another network when connectivity to a network is lost
* 4.Provide an API that allows applications to query the coarse-grained
* or fine-grained state of the available networks
* 千万不要忘了在manifest里面加个权限 ，粗心的朋友一定要记住：
* <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
*/
ConnectivityManager conman = (ConnectivityManager) this
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = conman.getActiveNetworkInfo();
if (netInfo != null && netInfo.isAvailable()) {//[size=14.399999618530273px]第二个条件也可以用[size=14.399999618530273px]netInfo.isConnected();
Toast.makeText(this, "OK网!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "貌似断网了!", Toast.LENGTH_SHORT).show();
}
}
012.判断SD状态
private final static int READ_AND_WRITE = 2;
private final static int READ_ONLY= １;
private final static int INVALID＝０;
public int getSDCardState(){
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return READ_AND_WRITE ;
} else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
return READ_ONLY;
} else {
return INVALID;
}
}
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