关于Intent实例调用:
1,调用外部程序:
参数1:Process Name
参数2:Application Class
try{ Intent eth = new Intent(); eth.setClassName("com.android.settings", "com.android.settings.EthernetSettings"); startActivity(eth); }catch(ActivityNotFoundException e) { //deal error code return ; }
2,调用SDK自带的
startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
3,调用自己写的实例
startActivity(new Intent(this, timecheck.class));
关于添加单击事件处理代码:
声明时需要调用接口:public class ITester extends Activity implements OnClickListener{...}
并添加单击事件: public void onClick(View v)
View dateTimeBtn = findViewById(R.id.btn_time_chk); dateTimeBtn.setOnClickListener(this);
如果需要获得单击的具体对象,需要用到方法: v.getId();
例如:
public void onClick(View v) { switch(v.getId()) { case R.id.btn_time_chk: startActivity(new Intent(this, timecheck.class)); break; } }
其他代码实例:
1,或者内部eMMC容量大小
File path = Environment.getDataDirectory(); StatFs stat = new StatFs(path.getPath()); long blockSize = stat.getBlockSize(); long totalBlocks = stat.getBlockCount(); long aBlocks = stat.getAvailableBlocks(); float Tsize = (float)blockSize * totalBlocks/(1024*1024*1024); float Asize = (float)blockSize * aBlocks/(1024*1024*1024);
2,获取系统当前时间:
import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.text.format.Time; import android.widget.TextView; public class timecheck extends ITester{ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.timecheck); handler.postDelayed(runnable, 1000); //delay 1000ms=1s } Handler handler=new Handler(); Runnable runnable=new Runnable(){ @Override public void run() { // TODO Auto-generated method stub TextView timeV = (TextView)findViewById(R.id.timeView); Time tm = new Time(); tm.setToNow(); //Get local time int year = tm.year; int mon = tm.month + 1; int day = tm.monthDay; int hour = tm.hour; int min = tm.minute; int sec = tm.second; timeV.setTextSize(39); timeV.setTextColor(Color.BLUE); timeV.setText("Now Time is: \n "+ year + "-" + mon + "-" + day + " " + hour + ":" + min + ":" + sec); handler.postDelayed(this, 500); //delay 500ms=0.5s } }; }
3,文件读写实例:
File f = new File("/sdcard/sdt.txt"); f.createNewFile(); FileOutputStream wf = new FileOutputStream(f); wf.write("\nSD_Test_String_from_iTester\nWritten By Tody \n(c) 2011 T-ware Inc.\n".getBytes()); // write string to file... wf.flush(); wf.close();File f = new File("/proc/meminfo"); BufferedReader r = new BufferedReader(new InputStreamReader( new FileInputStream( f )),32); String line = r.readLine();
4,对话框弹出实例: new AlertDialog.Builder(this).setMessage("请按电源按钮选择休眠(S3)测试").show();
5,振动器实例:
private Vibrator iVibrator; iVibrator = (Vibrator)getSystemService(VIBRATOR_SERVICE); iVibrator.vibrate(100); vibrateBtn.setBackgroundColor(Color.GREEN);
6,取消对话框实例:
new AlertDialog.Builder (this) .setTitle ("Alerting Message") .setMessage ("eek!") .setNegativeButton ("Close", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { //do nothing - it will close on its own } }) .show ();
7,确定对话框实例:
AlertDialog.Builder builder = new AlertDialog.Builder(MainDialog.this); builder.setIcon(R.drawable.icon); builder.setTitle("你确定要离开吗?"); builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { //这里添加点击确定后的逻辑 showDialog("你选择了确定"); } });
AndroidManifest.xml:定义权限及程序配置等:
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.example.itester" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="8" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/> <uses-permission android:name="android.permission.VIBRATE"/> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".ITester" android:label="@string/app_name" android:configChanges="orientation"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> <category android:name="android.intent.catetory.DEFAULT" /> </intent-filter> </activity> <activity android:name=".about" android:label="@string/about_title"> </activity> <activity android:name=".timecheck" android:label="@string/now_time_title" android:theme="@android:style/Theme.Dialog"> </activity> <activity android:name=".sdcard" android:label="@string/sd_title" android:theme="@android:style/Theme.Dialog"> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> </activity> <activity android:name=".meminfo" android:label="@string/mem_info_title" android:theme="@android:style/Theme.Dialog"> </activity> <activity android:name=".rgbchk" android:label="@string/rgb_chk"> </activity> </application> </manifest>