Develop系列-API Guides-应用组件-Intents and Intent Filters

/**
* Activity Action: 给用户显示数据。比如：在联系人中显示具体
* 联系人的信息；在邮件发件人中，显示可用的发件人列表。
* <p>Input: {@link #getData} is URI from which to retrieve data.
* <p>Output: nothing.
*/
@SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
public static final String ACTION_VIEW = "android.intent.action.VIEW";

public Intent setAction(String action) {
mAction = action != null ? action.intern() : null;
return this;
}

public Intent(String action) {
setAction(action);
}

public Intent setType(String type) {
mData = null;
mType = type;
return this;
}

public Intent setData(Uri data) {
mData = data;
mType = null;
return this;
}

public Intent setDataAndType(Uri data, String type) {
mData = data;
mType = type;
return this;
}

public Intent addCategory(String category) {
if (mCategories == null) {
mCategories = new ArraySet<String>();
}
mCategories.add(category.intern());
return this;
}

public Intent putExtra(String name, 类型 value) {
if (mExtras == null) {
mExtras = new Bundle();
}
mExtras.put类型(name, value);
return this;
}

public Intent putExtras(Bundle extras) {
if (mExtras == null) {
mExtras = new Bundle();
}
mExtras.putAll(extras);
return this;
}
public Intent putExtras(Intent src) {
if (src.mExtras != null) {
if (mExtras == null) {
mExtras = new Bundle(src.mExtras);
} else {
mExtras.putAll(src.mExtras);
}
}
return this;
}

EXTRA_EMAIL

EXTRA_SUBJECT

public Intent setFlags(int flags) {
mFlags = flags;
return this;
}

// 在Activity中执行，this表示当前Context
// fileUrl是个URL字串，比如"http://www.example.com/image.png"
Intent downloadIntent = new Intent(this, DownloadService.class);
downloadIntent.setData(Uri.parse(fileUrl));
startService(downloadIntent);

// Create the text message with a string
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, textMessage);
sendIntent.setType(HTTP.PLAIN_TEXT_TYPE); // "text/plain" MIME type

// Verify that the intent will resolve to an activity
if (sendIntent.resolveActivity(getPackageManager()) != null) {
startActivity(sendIntent);
}

Intent intent = new Intent(Intent.ACTION_SEND);
...

// Always use string resources for UI text.
// This says something like "Share this photo with"
String title = getResources().getString(R.string.chooser_title);
// Create intent to show chooser
Intent chooser = Intent.createChooser(intent, title);

// Verify the intent will resolve to at least one activity
if (intent.resolveActivity(getPackageManager()) != null) {
startActivity(chooser);
}

<action>

<data>

<category>

<activity android:name="ShareActivity">
<intent-filter>
<action android:name="android.intent.action.SEND"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:mimeType="text/plain"/>
</intent-filter>
</activity>

<activity android:name="MainActivity">
<!-- This activity is the main entry, should appear in app launcher -->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

<activity android:name="ShareActivity">
<!-- This activity handles "SEND" actions with text data -->
<intent-filter>
<action android:name="android.intent.action.SEND"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:mimeType="text/plain"/>
</intent-filter>
<!-- This activity also handles "SEND" and "SEND_MULTIPLE" with media data -->
<intent-filter>
<action android:name="android.intent.action.SEND"/>
<action android:name="android.intent.action.SEND_MULTIPLE"/>
<category android:name="android.intent.category.DEFAULT"/>
<data android:mimeType="application/vnd.google.panorama360+jpg"/>
<data android:mimeType="image/*"/>
<data android:mimeType="video/*"/>
</intent-filter>
</activity>

PendingIntent.getActivity()

PendingIntent.getService()

PendingIntent.getBroadcast()

ACTION_MAIN

CATEGORY_LAUNCHER