1,调web浏览器
Uri myBlogUri = Uri.parse("http://xxxxx.com");
returnIt = new Intent(Intent.ACTION_VIEW, myBlogUri);
2,地图
Uri mapUri = Uri.parse("geo:38.899533,-77.036476");
returnIt = new Intent(Intent.ACTION_VIEW, mapUri);
3,调拨打电话界面
Uri telUri = Uri.parse("tel:100861");
returnIt = new Intent(Intent.ACTION_DIAL, telUri);
4,直接拨打电话
Uri callUri = Uri.parse("tel:100861");
returnIt = new Intent(Intent.ACTION_CALL, callUri);
5,卸载
Uri uninstallUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);
6,安装
Uri installUri = Uri.fromParts("package", "xxx", null);
returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
7,播放
Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");
returnIt = new Intent(Intent.ACTION_VIEW, playUri);
8,掉用发邮件
Uri emailUri = Uri.parse("mailto:xxxx@gmail.com");
returnIt = new Intent(Intent.ACTION_SENDTO, emailUri);
9,发邮件
returnIt = new Intent(Intent.ACTION_SEND);
String[] tos = { "xxxx@gmail.com" };
String[] ccs = { "xxxx@gmail.com" };
returnIt.putExtra(Intent.EXTRA_EMAIL, tos);
returnIt.putExtra(Intent.EXTRA_CC, ccs);
returnIt.putExtra(Intent.EXTRA_TEXT, "body");
returnIt.putExtra(Intent.EXTRA_SUBJECT, "subject");
returnIt.setType("message/rfc882");
Intent.createChooser(returnIt, "Choose Email Client");
10,发短信
Uri smsUri = Uri.parse("tel:100861");
returnIt = new Intent(Intent.ACTION_VIEW, smsUri);
returnIt.putExtra("sms_body", "yyyy");
returnIt.setType("vnd.android-dir/mms-sms");
11,直接发邮件
Uri smsToUri = Uri.parse("smsto://100861");
returnIt = new Intent(Intent.ACTION_SENDTO, smsToUri);
returnIt.putExtra("sms_body", "yyyy");
12,发彩信
Uri mmsUri = Uri.parse("content://media/external/images/media/23");
returnIt = new Intent(Intent.ACTION_SEND);
returnIt.putExtra("sms_body", "yyyy");
returnIt.putExtra(Intent.EXTRA_STREAM, mmsUri);
returnIt.setType("image/png");
最后一步:
startActivity(returnIt)

如何把Button或者ImageButton的背景设为透明或者半透明?
android:background=”@android:color/transparent”
or
android:background="@null"
or
半透明<Button android:background="#e0000000"/>
透明<Button android:background="#00000000"/>

如何在TextView显示HTML?
TextView tv=(TextView)findViewById(R.id.tv);
Spanned text = Html.fromHtml("<a href='http://www.baidu.com'>baidu</a>");
tv.setText(text);
如果html中有图片,请参考这篇文章:
http://da-en.iteye.com/blog/712415


如何修改软键盘默认为数字输入?
EditText editText = (EditText) findViewById(R.id.et);
editText.setInputType(InputType.TYPE_CLASS_NUMBER); 

13.如何阻止EditText自动弹出输入法? 
editText.setOnTouchListener(new OnTouchListener() {  
                  
    public boolean onTouch(View v, MotionEvent event) {  
      
        //记住EditText的InputType现在是password   
        int inType = editText.getInputType(); // backup the input type  
        editText.setInputType(InputType.TYPE_NULL); // disable soft input      
        editText.onTouchEvent(event); // call native handler      
        editText.setInputType(inType); // restore input type     
        editText.setSelection(editText.getText().length());  
        return true;  
                      
    }  
});  

14.如何自定义标题栏? 
    //首先需要请求对FEATURE_CUSTOM_TITLE操作  
    requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);  
    view = new SnakeView(this);  
    setContentView(view);  
    //然后设置  
    getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title);  
R.layout.title对应的布局文件: 
    <?xml version="1.0" encoding="UTF-8"?>  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="horizontal"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"     >  
        <TextView  
        android:id="@+id/title"  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content"  
        android:layout_weight="1"  
        android:layout_gravity="center"  
        android:gravity="center"   
        android:text="Snake"  
        android:textColor="@color/red"  
        />  
    </LinearLayout>  
这里需要注意,最好不要修改背景色,否则会出现标题栏不会被充满的问题(会露马脚啦:)),如果确实需要修改背景色又不漏马脚,那么请看这篇文章:
http://www.iteye.com/topic/760314 

15.如何隐藏标题栏?
即:应用程序名称的那一栏 
    //注意:2行代码的先后顺序不能颠倒  
    requestWindowFeature(Window.FEATURE_NO_TITLE);  
    setContentView(R.layout.main);  
    //同时使用隐藏状态栏可以使可视面积最大化!  
    或者也可以在Manifest文件中这样设置:  
    <application android:icon="@drawable/icon"  
      android:label="@string/app_name"  
      android:theme="@android:style/Theme.NoTitleBar">