Android Activity和Intent机制学习笔记

<activity android:name="NotesList" android:label="@string/title_notes_list">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.EDIT" />
                <action android:name="android.intent.action.PICK" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.dir/vnd.google.note" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.GET_CONTENT" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:mimeType="vnd.android.cursor.item/vnd.google.note" />
            </intent-filter>
        </activity>

Intent用法实例

1.无参数Activity跳转

Intent it = new Intent(Activity.Main.this, Activity2.class);
startActivity(it);   

2.向下一个Activity传递数据（使用Bundle和Intent.putExtras）

Intent it = new Intent(Activity.Main.this, Activity2.class);
Bundle bundle=new Bundle();
bundle.putString("name", "This is from MainActivity!");
it.putExtras(bundle);       // it.putExtra(“test”, "shuju”);
startActivity(it);            // startActivityForResult(it,REQUEST_CODE);

对于数据的获取可以采用：

Bundle bundle=getIntent().getExtras();
String name=bundle.getString("name");

3.向上一个Activity返回结果（使用setResult，针对startActivityForResult(it,REQUEST_CODE)启动的Activity）

        Intent intent=getIntent();
        Bundle bundle2=new Bundle();
        bundle2.putString("name", "This is from ShowMsg!");
        intent.putExtras(bundle2);
        setResult(RESULT_OK, intent);

4.回调上一个Activity的结果处理函数（onActivityResult）

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==REQUEST_CODE){
            if(resultCode==RESULT_CANCELED)
                  setTitle("cancle");
            else if (resultCode==RESULT_OK) {
                 String temp=null;
                 Bundle bundle=data.getExtras();
                 if(bundle!=null)   temp=bundle.getString("name");
                 setTitle(temp);
            }
        }
    }

下面是转载来的其他的一些Intent用法实例（转自javaeye）

显示网页
   1. Uri uri = Uri.parse("http://google.com"); 
   2. Intent it = new Intent(Intent.ACTION_VIEW, uri); 
   3. startActivity(it);

显示地图
   1. Uri uri = Uri.parse("geo:38.899533,-77.036476"); 
   2. Intent it = new Intent(Intent.ACTION_VIEW, uri);  
   3. startActivity(it);  
   4. //其他 geo URI 範例 
   5. //geo:latitude,longitude 
   6. //geo:latitude,longitude?z=zoom 
   7. //geo:0,0?q=my+street+address 
   8. //geo:0,0?q=business+near+city 
   9. //google.streetview:cbll=lat,lng&cbp=1,yaw,,pitch,zoom&mz=mapZoom

路径规划
   1. Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en"); 
   2. Intent it = new Intent(Intent.ACTION_VIEW, uri); 
   3. startActivity(it); 
   4. //where startLat, startLng, endLat, endLng are a long with 6 decimals like: 50.123456 

打电话
   1. //叫出拨号程序 
   2. Uri uri = Uri.parse("tel:0800000123"); 
   3. Intent it = new Intent(Intent.ACTION_DIAL, uri); 
   4. startActivity(it); 
   1. //直接打电话出去 
   2. Uri uri = Uri.parse("tel:0800000123"); 
   3. Intent it = new Intent(Intent.ACTION_CALL, uri); 
   4. startActivity(it); 
   5. //用這個，要在 AndroidManifest.xml 中，加上 
   6. //<uses-permission id="android.permission.CALL_PHONE" /> 

传送SMS/MMS
   1. //调用短信程序 
   2. Intent it = new Intent(Intent.ACTION_VIEW, uri); 
   3. it.putExtra("sms_body", "The SMS text");  
   4. it.setType("vnd.android-dir/mms-sms"); 
   5. startActivity(it);
   1. //传送消息 
   2. Uri uri = Uri.parse("smsto://0800000123"); 
   3. Intent it = new Intent(Intent.ACTION_SENDTO, uri); 
   4. it.putExtra("sms_body", "The SMS text"); 
   5. startActivity(it);
   1. //传送 MMS 
   2. Uri uri = Uri.parse("content://media/external/images/media/23"); 
   3. Intent it = new Intent(Intent.ACTION_SEND);  
   4. it.putExtra("sms_body", "some text");  
   5. it.putExtra(Intent.EXTRA_STREAM, uri); 
   6. it.setType("image/png");  
   7. startActivity(it); 

传送 Email
   1. Uri uri = Uri.parse("mailto:xxx@abc.com"); 
   2. Intent it = new Intent(Intent.ACTION_SENDTO, uri); 
   3. startActivity(it); 

   1. Intent it = new Intent(Intent.ACTION_SEND); 
   2. it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com"); 
   3. it.putExtra(Intent.EXTRA_TEXT, "The email body text"); 
   4. it.setType("text/plain"); 
   5. startActivity(Intent.createChooser(it, "Choose Email Client")); 

   1. Intent it=new Intent(Intent.ACTION_SEND);   
   2. String[] tos={"me@abc.com"};   
   3. String[] ccs={"you@abc.com"};   
   4. it.putExtra(Intent.EXTRA_EMAIL, tos);   
   5. it.putExtra(Intent.EXTRA_CC, ccs);   
   6. it.putExtra(Intent.EXTRA_TEXT, "The email body text");   
   7. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");   
   8. it.setType("message/rfc822");   
   9. startActivity(Intent.createChooser(it, "Choose Email Client"));

   1. //传送附件
   2. Intent it = new Intent(Intent.ACTION_SEND); 
   3. it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text"); 
   4. it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3"); 
   5. sendIntent.setType("audio/mp3"); 
   6. startActivity(Intent.createChooser(it, "Choose Email Client"));

播放多媒体
       Uri uri = Uri.parse("file:///sdcard/song.mp3"); 
       Intent it = new Intent(Intent.ACTION_VIEW, uri); 
       it.setType("audio/mp3"); 
       startActivity(it);
       Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1"); 
       Intent it = new Intent(Intent.ACTION_VIEW, uri); 
       startActivity(it);

Market 相关
1.        //寻找某个应用
2.        Uri uri = Uri.parse("market://search?q=pname:pkg_name");
3.        Intent it = new Intent(Intent.ACTION_VIEW, uri); 
4.        startActivity(it); 
5.        //where pkg_name is the full package path for an application
1.        //显示某个应用的相关信息
2.        Uri uri = Uri.parse("market://details?id=app_id"); 
3.        Intent it = new Intent(Intent.ACTION_VIEW, uri);
4.        startActivity(it); 
5.        //where app_id is the application ID, find the ID  
6.        //by clicking on your application on Market home  
7.        //page, and notice the ID from the address bar

Uninstall 应用程序
1.        Uri uri = Uri.fromParts("package", strPackageName, null);
2.        Intent it = new Intent(Intent.ACTION_DELETE, uri);  
3.        startActivity(it);