Activity启动系统服务

* 1、启动浏览器：
 * intent.setAction(Intent.ACTION_VIEW);
 * Uri uri = Uri.parse("http://www.sina.com");
 * intent.setData(uri);
 * startActivity(intent);
 * 
 * 2、启动相册：
 * intent.setAction(Intent.ACTION_GET_CONTENT);
 * intent.setType("image/*");
 * startActivity(intent);
 * 
 * 3、启动短信：
 * intent.setAction(Intent.ACTION_SEND);
 * intent.setType("text/plain");
 * intent.putExtra(Intent.EXTRA_TEXT, "这是一条短信！");
 * startActivity(intent);
 * 4、启动电话界面：
 * intent.setAction(Intent.ACTION_VIEW);
 * Uri uri2 = Uri.parse("tel:10010");
 * intent.setData(uri2);

 * startActivity(intent);

public class StartSystemActivity extends Activity implements OnClickListener{

	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_start_system);
		
		Button btn_switch1 = (Button) findViewById(R.id.btn_switch1);
		btn_switch1.setOnClickListener(this);
		Button btn_switch2 = (Button) findViewById(R.id.btn_switch2);
		btn_switch2.setOnClickListener(this);
		Button btn_switch3 = (Button) findViewById(R.id.btn_switch3);
		btn_switch3.setOnClickListener(this);
		Button btn_switch4 = (Button) findViewById(R.id.btn_switch4);
		btn_switch4.setOnClickListener(this);
	}

	@Override
	public void onClick(View v) {
		Intent intent = new Intent();
		switch(v.getId()){
		case R.id.btn_switch1:
			intent.setAction(Intent.ACTION_VIEW);
			Uri uri = Uri.parse("http://www.sina.com");
			intent.setData(uri);
			startActivity(intent);
			break;
		case R.id.btn_switch2:
			intent.setAction(Intent.ACTION_GET_CONTENT);
			intent.setType("image/*");
			startActivity(intent);
			break;
		case R.id.btn_switch3:
			intent.setAction(Intent.ACTION_SEND);
			intent.setType("text/plain");
			intent.putExtra(Intent.EXTRA_TEXT, "这是一条短信！");
			startActivity(intent);
			break;
		case R.id.btn_switch4:
			intent.setAction(Intent.ACTION_VIEW);
			Uri uri2 = Uri.parse("tel:10010");
			intent.setData(uri2);
			startActivity(intent);
			break;
		}
	}
	
}

activity_start_system.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.imooc.activitystudy.OneActivity" >

    <Button 
        android:id="@+id/btn_switch1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动浏览器" />
    <Button 
        android:layout_below="@id/btn_switch1"
        android:id="@+id/btn_switch2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动相册" />
    <Button 
        android:layout_below="@id/btn_switch2"
        android:id="@+id/btn_switch3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动短信" />
    <Button 
        android:layout_below="@id/btn_switch3"
        android:id="@+id/btn_switch4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动电话界面" />

</RelativeLayout>