android commonly used

8.

7.

// double click to exit
	private long lastBackPressedTime;
	@Override
	public void onBackPressed() {
		if(System.currentTimeMillis() - lastBackPressedTime < 2000L) {
			super.onBackPressed();
		} else {
			lastBackPressedTime = System.currentTimeMillis();
			Toast.makeText(this, R.string.exit_toast, Toast.LENGTH_SHORT).show();
			return;
		}
	}

6.

private Dialog showFontSizeDialog() {
    	final String[] sizes = {"24", "28", "32", "36", "40"};
    	AlertDialog.Builder dialog = new AlertDialog.Builder(mActivity.getAndroidContext());
    	dialog.setTitle(R.string.pref_video_settings_subtitle_fontsize_dialogtitle);
    	dialog.setItems(sizes, new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface arg0, int arg1) {
				// TODO Auto-generated method stub
				int clickedInt = Integer.valueOf(sizes[arg1]);
				SharedPreferences.Editor editor0 = mPrefs.edit();
				editor0.putString("pref_video_settings_subtitle_fontsize_key", String.valueOf(clickedInt));
				editor0.commit();
				
				itemClicked.setTitle(clickedInt + " (choose subtitle font size)");
				Toast.makeText(mActivity.getAndroidContext(), "you chosed the font size of " + clickedInt, 
						Toast.LENGTH_SHORT).show();
			}
		});
    	
    	return dialog.show();
    }
    // end

5.

                mSubtitleEnabled = (mSubtitleEnabled ? false : true);
                SharedPreferences.Editor editor1 = mPrefs.edit();
                editor1.putBoolean("pref_video_settings_subtitle_key", mSubtitleEnabled);
                editor1.commit();

editText1 =(EditText) DialogView.findViewById(R.id.editText1);

       SharedPreferences sp = Context.getSharedPreferences("SP", MODE_PRIVATE);
       //存入數據
        Editor editor = sp.edit();
       editor.putString("STRING_KEY", "string");
       editor.putInt("INT_KEY", 0);
       editor.putBoolean("BOOLEAN_KEY", true);
       editor.commit();

4. some xml attribute strangers:

android:textSize="20.0sp"      android:layout_margin="5.0dip"            //remember the unit
android:textColor="#ff000000"                                                        //black<ImageButton android:src="@drawable/management_add" />            //styles.xml  <style name="CustomStyle"> <item>...
<EditText style="@style/MainText"/>
LinearLayout 滾動效果 將其放在
<ScrollView android:layout_width="fill_parent"android:layout_height="fill_parent"android:scrollbars="vertical"android:fadingEdge="vertical"><LinearLayout     android:id="@+id/hottopics"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="wrap_content" android:padding="10dip"android:scrollbars="vertical"></LinearLayout>
</ScrollView>

3.運用系統電話，短信程序

Dial:
if(phone_number.equals("")) {
                    Toast.makeText(MainActivity.this, R.string.str_warning_phone_null, Toast.LENGTH_LONG).show();
                } else {
                    Intent intent = new Intent(Intent.ACTION_CALL, Uri.parse("tel:" + phone_number));
                    MainActivity.this.startActivity(intent);
                }
SMS:
Intent smsIntent = new Intent(Intent.ACTION_SENDTO, Uri.parse("smsto:" + mEntry.getNO()));startActivity(smsIntent);

2.去除標題欄  

getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,   
    WindowManager.LayoutParams.FLAG_FULLSCREEN);   
 // 去除標題欄  
 requestWindowFeature(Window.FEATURE_NO_TITLE);

 

1.listview拖動時背景變黑的問題

方法：在ListView中添加一個屬性，android:cacheColorHint="#00000000"