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android脚步---Itent.ACTION_PICK ,startActivityForResult

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();

然后重写方法,对应:

@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得到数据库指针 cursor,指向data.getData,像是一条条存储,cursor.moveToFirst();指向存储的第一条,int idx = cursor.getColumnIndex(ImageColumns.DATA);idx相当一个索引,指向(ImageColumns.DATA,

requestCode很重要,startActivityForResult(Intent intent, int requestCode)中startActivityForResult中两个参数对应的requestCode,

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

代码中:Intent intent = new Intent(Intent.ACTION_PICK);

        android之Itent.ACTION_PICK  Intent.ACTION_GET_CONTENT妙用             

你是不是很多时候,想从弹出的电话本姓名列表中中查找到某个人,然后再获取该人的详细信息呢?

你是不是想选择从弹出的列表中选择一张图片,然后将其进行进一步的操作呢?

如果,你想,那你是不是很像知道,我们应该怎么让其弹出来一张选择列表,又应该怎么代码实现后边的操作呢?

Itent.ACTION_PICK  Intent.ACTION_GET_CONTENT 两者都可以完成类似的功能,让我们一起来看下例子

第一:Intent.ACTION_PICK

首先添加一个权限: <uses-permission android:name="android.permission.READ_CONTACTS"/>
发起一个 Contact Picker
Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI);
startActivityForResult(intent, PICK_CONTACT);
然后:
重写方法
@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是数据库的知识,相当于数据库中的指针,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
 
我们可以发现,其实action_get_content是通过intent中设置的type属性来判断具体调用哪个程序的。
  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"));

执行之 会弹出一个对话框 效果为:

 

其实 对于这段代码 大家应该都能猜出什么意思  现自己模拟并理解

[代码]

 

1. 定义TestActivity 用于根据传入Uri  播放目标

 

<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 注册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 运行截图:

 

 

此外:

 

   //选择图片 requestCode 返回的标识  Intent innerIntent = new Intent(Intent.ACTION_GET_CONTENT); //"android.intent.action.GET_CONTENT"  innerIntent.setType(contentType); //查看类型 String IMAGE_UNSPECIFIED = "image/*";  Intent wrapperIntent = Intent.createChooser(innerIntent, null);  ((Activity) context).startActivityForResult(wrapperIntent, requestCode);   //视频  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);   //添加音频  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);   //录音  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);   //拍摄视频  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 为返回的标识  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脚步---Itent.ACTION_PICK ,startActivityForResult