android腳步---Itent.ACTION_PICK ，startActivityForResult

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public void onClick(View v) {        // TODO Auto-generated method stub        Intent intent = new Intent(Intent.ACTION_PICK);        intent.setType("image/*");        switch (v.getId()) {        case R.id.btFirst:            startActivityForResult(intent, 1);                    break;        case R.id.btSecond:            startActivityForResult(intent, 2);            break;        case R.id.btDetect:            final String firstPath = etFirst.getText().toString();            final String secondPath = etSecond.getText().toString();

然後重寫方法，對應：

@Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        // TODO Auto-generated method stub        super.onActivityResult(requestCode, resultCode, data);        if (data != null) {            Cursor cursor = getContentResolver().query(data.getData(), null,                    null, null, null);            cursor.moveToFirst();            int idx = cursor.getColumnIndex(ImageColumns.DATA);            String fileSrc = cursor.getString(idx);            if (requestCode == 1) {                etFirst.setText(fileSrc);            } else if (requestCode == 2) {                etSecond.setText(fileSrc);            }            cursor.close();        }    }

Cursor cursor得到資料庫指標 cursor，指向data.getData，像是一條條儲存，cursor.moveToFirst();指向儲存的第一條，int idx = cursor.getColumnIndex(ImageColumns.DATA);idx相當一個索引，指向(ImageColumns.DATA，

requestCode很重要，startActivityForResult(Intent intent, int requestCode)中startActivityForResult中兩個參數對應的requestCode，

http://blog.csdn.net/chenzheng_java/article/details/6266135

代碼中：Intent intent = new Intent(Intent.ACTION_PICK);

        android之Itent.ACTION_PICK  Intent.ACTION_GET_CONTENT妙用             

你是不是很多時候，想從彈出的電話本姓名列表中中尋找到某個人，然後再擷取該人的詳細資料呢？

你是不是想選擇從彈出的列表中選擇一張圖片，然後將其進行進一步的操作呢？

如果，你想，那你是不是很像知道，我們應該怎麼讓其彈出來一張挑選清單，又應該怎麼代碼實現後邊的操作呢？

Itent.ACTION_PICK  Intent.ACTION_GET_CONTENT 兩者都可以完成類似的功能，讓我們一起來看下例子

第一：Intent.ACTION_PICK

首先添加一個許可權： <uses-permission android:name="android.permission.READ_CONTACTS"/>發起一個 Contact PickerIntent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI);startActivityForResult(intent, PICK_CONTACT);然後：重寫方法

@Override public void onActivityResult(int reqCode, int resultCode, Intent data)   {        super.onActivityResult(reqCode, resultCode, data);          switch (reqCode) {              case (PICK_CONTACT) :                   if (resultCode == Activity.RESULT_OK) {                     Uri contactData = data.getData();                     Cursor c =  managedQuery(contactData, null, null, null, null);                     if (c.moveToFirst()) {                          String name = c.getString(c.getColumnIndexOrThrow(People.NAME));                          // TODO Whatever you want to do with the selected contact name.                                         }                            }                           break;                           }    } 

     其中cursor是資料庫的知識，相當於資料庫中的指標，query得到contactdata，
例如

String[] columns = new String[] {People.NAME}; int[] names = new int[] {R.id.row_entry}; mAdapter = new SimpleCursorAdapter(this, R.layout.mycontacts, C, columns, names）； setListAdapter(mAdapter); 

 

第二：Intent.ACTION_GET_CONTENT 我們可以發現，其實action_get_content是通過intent中設定的type屬性來判斷具體調用哪個程式的。

1. Intent intent = new Intent(Intent.ACTION_GET_CONTENT);   
2. intent.setType("audio/*");   
3. startActivity(Intent.createChooser(intent, "Select music"));  

[java] view plaincopyprint?

1. <span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;">Intent intent = new Intent(Intent.ACTION_GET_CONTENT);  
2. intent.setType("audio/*");  
3. startActivity(Intent.createChooser(intent, "Select music"));</span></span>  

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);intent.setType("audio/*");startActivity(Intent.createChooser(intent, "Select music"));

執行之 會彈出一個對話方塊 效果為：

 

其實 對於這段代碼 大家應該都能猜出什麼意思  現自己類比並理解

[代碼]

 

1. 定義TestActivity 用於根據傳入Uri  播放目標

 

<span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;">public class TestActivity extends Activity {        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        this.setTitle("TestActivity");                Intent i = this.getIntent();                Uri u = i.getData();                try {            playMusic(u);        } catch (IllegalArgumentException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (SecurityException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IllegalStateException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }        public void playMusic(Uri uri) throws IllegalArgumentException, SecurityException, IllegalStateException, IOException{        MediaPlayer mp = new MediaPlayer();        mp.setDataSource(this, uri);        mp.prepare();        mp.start();    }}</span></span>

 

2. 在AndroidManifest 註冊TestActivity

 

<span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;"><activity android:name=".TestActivity"                  android:label="TestActivity">            <intent-filter>                <action android:name="android.intent.action.GET_CONTENT" />                 <category android:name="android.intent.category.DEFAULT" />                 <category android:name="android.intent.category.OPENABLE" />                 <data android:mimeType="audio/music1" />            </intent-filter>        </activity></span></span>

 

3. 使用TestActivity

 

<span style="font-family: comic sans ms,sans-serif;"><span style="font-size: x-small;">public void sendChooser(){        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);                intent.setDataAndType(Uri.parse("file:///sdcard/DCIM/cc.mp3"), "audio/music1");        startActivity(Intent.createChooser(intent, "Select music1 app"));    }</span></span>

 

4. emulator 運行：

 

 

此外：

 

   //選擇圖片 requestCode 返回的標識　　Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT); //"android.intent.action.GET_CONTENT"　　innerIntent.setType(contentType); //查看類型 String IMAGE_UNSPECIFIED = "image/*";　　Intent wrapperIntent = Intent.createChooser(innerIntent, null);　　((Activity) context).startActivityForResult(wrapperIntent, requestCode); 　　//視頻　　Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);　　innerIntent.setType(contentType); //String VIDEO_UNSPECIFIED = "video/*";　　Intent wrapperIntent = Intent.createChooser(innerIntent, null);　　((Activity) context).startActivityForResult(wrapperIntent, requestCode); 　　//添加音頻　　Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT);　　innerIntent.setType(contentType); //String VIDEO_UNSPECIFIED = "video/*";　　Intent wrapperIntent = Intent.createChooser(innerIntent, null);　　((Activity) context).startActivityForResult(wrapperIntent, requestCode); 　　//錄音　　Intent intent = new Intent(Intent.ACTION_GET_CONTENT);　　intent.setType(ContentType.AUDIO_AMR); //String AUDIO_AMR = "audio/amr";　　intent.setClassName("com.android.soundrecorder",　　"com.android.soundrecorder.SoundRecorder");　　((Activity) context).startActivityForResult(intent, requestCode); 　　//拍攝視頻　　int durationLimit = getVideoCaptureDurationLimit(); //SystemProperties.getInt("ro.media.enc.lprof.duration", 60);　　Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);　　intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);　　intent.putExtra(MediaStore.EXTRA_SIZE_LIMIT, sizeLimit);　　intent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, durationLimit);　　startActivityForResult(intent, REQUEST_CODE_TAKE_VIDEO); 　　//拍照 REQUEST_CODE_TAKE_PICTURE 為返回的標識　　Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //"android.media.action.IMAGE_CAPTURE";　　intent.putExtra(MediaStore.EXTRA_OUTPUT, Mms.ScrapSpace.CONTENT_URI); // output,Uri.parse("content://mms/scrapSpace");　　startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE);

 

 

android腳步---Itent.ACTION_PICK ，startActivityForResult