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