你是不是很多時候，想從彈出的電話本姓名列表中中查找到某個人，然后再獲取該人的詳細信息呢？ 你是不是想選擇從彈出的列表中選擇一張圖片，然后將其進行進一步的操作呢？
如果，你想，那你是不是很像知道，我們應該怎么讓其彈出來一張選擇列表，又應該怎么代碼實現后邊的操作呢？
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：
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第一：Intent.ACTION_PICK
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首先添加一個權限：?
<uses-permission android:name="android.permission.READ_CONTACTS"/>?
發起一個 Contact Picker?
Intent intent = new Intent(Intent.ACTION_PICK, People.CONTENT_URI);?
startActivityForResult(intent, PICK_CONTACT);?
重寫方法?
@Override?
public void onActivityResult(int reqCode, int resultCode, Intent data)?
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????? 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;??
????????????????
???????? }?
?? }?
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中設置的type屬性來判斷具體調用哪個程序的。
Intent?intent?=?new?Intent(Intent.ACTION_GET_CONTENT); ??intent.setType("audio/*"); ??startActivity(Intent.createChooser(intent,?"Select?music"));?? [java]?view plaincopy
<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>?? ?
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執行之 會彈出一個對話框 效果為：
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其實 對于這段代碼 大家應該都能猜出什么意思? 現自己模擬并理解之
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[代碼]
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1. 定義TestActivity 用于根據傳入Uri??播放目標
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Java代碼
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)?{ ??????????????????????????e.printStackTrace(); ??????????}?catch?(SecurityException?e)?{ ??????????????????????????e.printStackTrace(); ??????????}?catch?(IllegalStateException?e)?{ ??????????????????????????e.printStackTrace(); ??????????}?catch?(IOException?e)?{ ??????????????????????????e.printStackTrace(); ??????????} ??????} ?????? ??????public?void?playMusic(Uri?uri)?throws?IllegalArgumentException,?SecurityException,?IllegalStateException,?IOException{ ??????????MediaPlayer?mp?=?new?MediaPlayer(); ??????????mp.setDataSource(this,?uri); ??????????mp.prepare(); ??????????mp.start(); ??????} ??}?? [java]?view plaincopy
<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)?{??????????????????????????e.printStackTrace();??????????}?catch?(SecurityException?e)?{??????????????????????????e.printStackTrace();??????????}?catch?(IllegalStateException?e)?{??????????????????????????e.printStackTrace();??????????}?catch?(IOException?e)?{??????????????????????????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>?? ?
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2. 在AndroidManifest 注冊TestActivity
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Java代碼
<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>?? [java]?view plaincopy
<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>?? ?
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3. 使用TestActivity
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Java代碼
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")); ??????}?? [java]?view plaincopy
<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>?? ?
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4. emulator 運行截圖：
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此外：
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???//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);
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//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);
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//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);
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//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);
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//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);
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//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);
- 上一篇android之聲音管理器AudioManager的使用
- 下一篇android之BitMap
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