一个App调用另一个App的Activity的方法

  FristActivity的代码：
Intent intent = new Intent();
				intent.putExtra("userinfo", userInfoText.getText().toString());
				ComponentName  componetName = new ComponentName("com.niuba.second","com.niuba.second.SecondActivity");
				intent.setComponent(componetName);
				startActivity(intent);
SecondActivity的代码：

public class SecondActivity extends Activity {
  private EditText userinfo;
  private LinearLayout  linearLayout = null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		userinfo = (EditText) findViewById(R.id.userinfo);
		linearLayout = (LinearLayout) findViewById(R.id.linearLayout);
		String userinfoStr = getIntent().getStringExtra("userinfo");
		userinfoStr = userinfoStr==null?"":userinfoStr.toUpperCase();
		if(userinfoStr.equals("A")){
			setBackground();
		}else{
			setBackground2();
		}
		userinfo.setText(userinfoStr);
	}

	/**
	 * 
	 * setBackground(设置背景图片1)
	 * @Exception 异常对象
	 * @since  CodingExample　Ver(编码范例查看) 1.1
	 */
	public void setBackground(){
		linearLayout.setBackgroundResource(R.drawable.picture1);
	}
	
	/**
	 * 
	 * setBackground(设置背景图片2)
	 * @Exception 异常对象
	 * @since  CodingExample　Ver(编码范例查看) 1.1
	 */
	public void setBackground2(){
		linearLayout.setBackgroundResource(R.drawable.picture2);
	}