Android分享功能

package com.ghstudio.sharetest;  
import java.util.List;  
import android.app.Activity;  
import android.content.Intent;  
import android.content.pm.PackageManager;  
import android.content.pm.ResolveInfo;  
import android.os.Bundle;  
import android.view.Menu;  
import android.view.MenuItem;  
public class Main extends Activity {  
@Override  
public void onCreate(Bundle savedInstanceState) {  
　　super.onCreate(savedInstanceState);  
　　setContentView(R.layout.main);   
} 
/* 创建菜单 */  
public boolean onCreateOptionsMenu(Menu menu) {  
　　menu.add(0,0,0,"分享");   
　　return true;  
}  
public boolean onOptionsItemSelected(MenuItem item){  
　　switch (item.getItemId()){  
　　case 0:  
　　　　Intent intent=new Intent(Intent.ACTION_SEND);  
　　　　//intent.setType("text/plain");  //纯文本
　　　　/*图片分享
　　　　it.setType("image/png");
　　　　　//添加图片
 　　　　 File f = new File(Environment.getExternalStorageDirectory()
 　　　　　　 +"/Pictures/2.png");
 　　　　 Uri u = Uri.fromFile(f);
 　　　　 it.putExtra(Intent.EXTRA_STREAM, u);
　　　　　*/

　　　　intent.putExtra(Intent.EXTRA_SUBJECT, "分享");  
　　　　intent.putExtra(Intent.EXTRA_TEXT, "I would like to share this with you...");  
　　　　startActivity(Intent.createChooser(intent, getTitle()));  
　　　　return true;  
　　}  
　　return false;  
}  
}

Android分享功能的代码解析：首先创建一个Options菜单，该菜单只有一个项“分享”。当点击菜单项时，创建一个Intent。该Intent设置为发送给支持ACTION_SEND的Activity。用两个putExtra给Intent设置了SUBJECT和TEXT的数据，再用startActivity方法让系统调用适当的Activity执行之。createChooser方法接受Intent做参数，也同时接纳了Intent里面要求的filter（ACTION_SEND），只有支持ACTION_SEND的Activity才会被列入可选列表。

Share via Facebook

Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND); shareIntent.setType("text/plain"); shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Content to share"); PackageManager pm = v.getContext().getPackageManager(); List activityList = pm.queryIntentActivities(shareIntent, 0); for (final ResolveInfo app : activityList) { if ((app.activityInfo.name).contain("facebook")) { final ActivityInfo activity = app.activityInfo; final ComponentName name = new ComponentName(activity.applicationInfo.packageName, activity.name); shareIntent.addCategory(Intent.CATEGORY_LAUNCHER); shareIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); shareIntent.setComponent(name); v.getContext().startActivity(shareIntent); break; } }

Bonus - Share via Twitter

Intent shareIntent = new Intent(android.content.Intent.ACTION_SEND); shareIntent.setType("text/plain"); shareIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Content to share"); PackageManager pm = v.getContext().getPackageManager(); List activityList = pm.queryIntentActivities(shareIntent, 0); for (final ResolveInfo app : activityList) { if ("com.twitter.android.PostActivity".equals(app.activityInfo.name)) { final ActivityInfo activity = app.activityInfo; final ComponentName name = new ComponentName(activity.applicationInfo.packageName, activity.name); shareIntent.addCategory(Intent.CATEGORY_LAUNCHER); shareIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); shareIntent.setComponent(name); v.getContext().startActivity(shareIntent); break; } }