1. dp px 相互转换---------------
public class DensityUtil {
/**
* 根据手机的分辨率从 dip 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) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
}
private void turnGPSOn(){
String provider = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(!provider.contains("gps")){ //if gps is disabled
final Intent poke = new Intent();
poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
}
private void turnGPSOff(){
String provider = Settings.Secure.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if(provider.contains("gps")){ //if gps is enabled
final Intent poke = new Intent();
poke.setClassName("com.android.settings", "com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
}
root 下禁用组件
pm disable com.htc.htclocationservice/com.htc.htclocationservice.AutoSettingReceiver
根据url获取真实路径
public static String getRealFilePath( final Context context, final Uri uri ) {
if ( null == uri ) return null;
final String scheme = uri.getScheme();
String data = null;
if ( scheme == null )
data = uri.getPath();
else if ( ContentResolver.SCHEME_FILE.equals( scheme ) ) {
data = uri.getPath();
} else if ( ContentResolver.SCHEME_CONTENT.equals( scheme ) ) {
Cursor cursor = context.getContentResolver().query( uri, new String[] { ImageColumns.DATA }, null, null, null );
if ( null != cursor ) {
if ( cursor.moveToFirst() ) {
int index = cursor.getColumnIndex( ImageColumns.DATA );
if ( index > -1 ) {
data = cursor.getString( index );
}
}
cursor.close();
}
}
return data;
}
Android 还原短信
ContentValues values = new ContentValues(); values.put("address", "123456789"); values.put("body", "haha"); values.put("date", "135123000000"); getContentResolver().insert(Uri.parse("content://sms/sent"), values);
横竖屏切换
< activity android:name="MyActivity"
android:configChanges="orientation|keyboardHidden">
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
//加入横屏要处理的代码
}else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
//加入竖屏要处理的代码
}
}
获取mac地址
1、<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
2、private String getLocalMacAddress() {
WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
return info.getMacAddress();
}
获取sd卡状态
/** 获取存储卡路径 */
File sdcardDir=Environment.getExternalStorageDirectory();
/** StatFs 看文件系统空间使用情况 */
StatFs statFs=new StatFs(sdcardDir.getPath());
/** Block 的 size*/
Long blockSize=statFs.getBlockSize();
/** 总 Block 数量 */
Long totalBlocks=statFs.getBlockCount();
/** 已使用的 Block 数量 */
Long availableBlocks=statFs.getAvailableBlocks();
Android获取状态栏和标题栏的高度
1.Android获取状态栏高度:
decorView是window中的最顶层view,可以从window中获取到decorView,然后decorView有个getWindowVisibleDisplayFrame方法可以获取到程序显示的区域,包括标题栏,但不包括状态栏。
于是,我们就可以算出状态栏的高度了。
Rect frame = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
2.获取标题栏高度:
getWindow().findViewById(Window.ID_ANDROID_CONTENT)这个方法获取到的view就是程序不包括标题栏的部分,然后就可以知道标题栏的高度了。
int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
//statusBarHeight是上面所求的状态栏的高度
int titleBarHeight = contentTop - statusBarHeight
例子代码:
package com.cn.lhq;
import android.app.Activity;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
import android.widget.ImageView;
public class Main extends Activity {
ImageView iv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
iv = (ImageView) this.findViewById(R.id.ImageView01);
iv.post(new Runnable() {
public void run() {
viewInited();
}
});
Log.v("test", "== ok ==");
}
private void viewInited() {
Rect rect = new Rect();
Window window = getWindow();
iv.getWindowVisibleDisplayFrame(rect);
int statusBarHeight = rect.top;
int contentViewTop = window.findViewById(Window.ID_ANDROID_CONTENT)
.getTop();
int titleBarHeight = contentViewTop - statusBarHeight;
// 测试结果:ok之后 100多 ms 才运行了
Log.v("test", "=-init-= statusBarHeight=" + statusBarHeight
+ " contentViewTop=" + contentViewTop + " titleBarHeight="
+ titleBarHeight);
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/ImageView01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
//取得窗口属性
getWindowManager().getDefaultDisplay().getMetrics(dm);
//窗口的宽度
int screenWidth = dm.widthPixels;
//窗口高度
int screenHeight = dm.heightPixels;
textView = (TextView)findViewById(R.id.textView01);
textView.setText("屏幕宽度: " + screenWidth + "\n屏幕高度: " + screenHeight);
二、获取状态栏高度
decorView是window中的最顶层view,可以从window中获取到decorView,然后decorView有个getWindowVisibleDisplayFrame方法可以获取到程序显示的区域,包括标题栏,但不包括状态栏。
于是,我们就可以算出状态栏的高度了。
view plain
Rect frame = new Rect();
getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
三、获取标题栏高度
getWindow().findViewById(Window.ID_ANDROID_CONTENT)这个方法获取到的view就是程序不包括标题栏的部分,然后就可以知道标题栏的高度了。
view plain
int contentTop = getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
//statusBarHeight是上面所求的状态栏的高度
int titleBarHeight = contentTop - statusBarHeight
问题的提出
Android Home键系统负责监听,捕获后系统自动处理。有时候,系统的处理往往不随我们意,想自己处理点击Home后的事件,那怎么办?
问题的解决
先禁止Home键,再在onKeyDown里处理按键值,点击Home键的时候就把程序关闭,或者随你XXOO。
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{ // TODO Auto-generated method stub
if(KeyEvent.KEYCODE_HOME==keyCode)
android.os.Process.killProcess(android.os.Process.myPid());
return super.onKeyDown(keyCode, event);
}
@Override
public void onAttachedToWindow()
{ // TODO Auto-generated method stub
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}
加权限禁止Home键
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission>
public class StartupReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Intent startupintent = new Intent(context,StrongTracks.class);
startupintent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(startupintent);
}
}
2)<receiver
android:name=".StartupReceiver">
<intent-filter>
<!-- 系统启动完成后会调用 -->
<action
android:name="android.intent.action.BOOT_COMPLETED">
</action>
</intent-filter>
</receiver>
window =dialog.getWindow();// 得到对话框的窗口.
WindowManager.LayoutParams wl = window.getAttributes();
wl.x = x;//这两句设置了对话框的位置.0为中间
wl.y =y;
wl.width =w;
wl.height =h;
wl.alpha =0.6f;// 这句设置了对话框的透明度
1、找到android模拟器安装目录:C:\Documents and Settings\Administrator\.android\avd\AVD23.avd
2、编辑config.ini文件,就是这块配置错误导致错误产生。
3、如果硬盘空间比较紧张,可以把模拟器文件放到其它盘符上:你可以在命令行下用mkcard创建一个SDCARD文件,如: mksdcard 50M D:\sdcard.img
4、下面代码可以整个覆盖原来的config文件 hw.sdCard=yes hw.lcd.density=240 skin.path=800×480 skin.name=800×480 vm.heapSize=24 sdcard.path=D:\sdcard.img hw.ramSize=512 image.sysdir.1=platforms\android-8\images\
5、OK,模拟器正常运行
挪动dialog的位置
Window mWindow = dialog.getWindow();
WindowManager.LayoutParams lp = mWindow.getAttributes();
lp.x = 10; //新位置X坐标
lp.y = -100; //新位置Y坐标
dialog.onWindowAttributesChanged(lp);
判断网络状态
<uses-permission
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;
}
设置 apn
ContentValues values = new ContentValues();
values.put(NAME, "CMCC cmwap");
values.put(APN, "cmwap");
values.put(PROXY, "10.0.0.172");
values.put(PORT, "80");
values.put(MMSPROXY, "");
values.put(MMSPORT, "");
values.put(USER, "");
values.put(SERVER, "");
values.put(PASSWORD, "");
values.put(MMSC, "");
values.put(TYPE, "");
values.put(MCC, "460");
values.put(MNC, "00");
values.put(NUMERIC, "46000");
reURI = getContentResolver().insert(Uri.parse("content://telephony/carriers"), values);
//首选接入点"content://telephony/carriers/preferapn"
调节屏幕的亮度
、
、
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);
}
第一,root权限,这是必须的
第二,Runtime.getRuntime().exec("su -c reboot");
第三,模拟器上运行不出来,必须真机
第四,运行时会提示你是否加入列表 , 同意就好
隐藏软键盘
setContentView(R.layout.activity_main);
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE |
WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
1、//隐藏软键盘
((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(WidgetSearchActivity.this.getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
2、//显示软键盘,控件ID可以是EditText,TextView
((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE)).showSoftInput(控件ID, 0);
Bitmap 工具类
(1) BitMap to inputStream:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
InputStream isBm = new ByteArrayInputStream(baos .toByteArray());
(2)BitMap to byte[]:
Bitmap defaultIcon = BitmapFactory.decodeStream(in);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
defaultIcon.compress(Bitmap.CompressFormat.JPEG, 100, stream);
byte[] bitmapdata = stream.toByteArray();
(3)Drawable to byte[]:
Drawable d; // the drawable (Captain Obvious, to the rescue!!!)
Bitmap bitmap = ((BitmapDrawable)d).getBitmap();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
defaultIcon.compress(Bitmap.CompressFormat.JPEG, 100, bitmap);
byte[] bitmapdata = stream.toByteArray();
(4)byte[] to Bitmap :
Bitmap bitmap =BitmapFactory.decodeByteArray(byte[], 0,byte[].length);
发送指令:
out = process.getOutputStream();
out.write(("am start -a android.intent.action.VIEW -n com.android.browser/com.android.browser.BrowserActivity\n").getBytes());
out.flush();
InputStream in = process.getInputStream();
BufferedReader re = new BufferedReader(new InputStreamReader(in));
String line = null;
while((line = re.readLine()) != null) {
Log.d("conio","[result]"+line);
}