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
@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);
- 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);
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