layout文件：

MainActivity.java:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private Button webbutton = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webbutton = (Button)super.findViewById(R.id.webbutton);
webbutton.setOnClickListener(this);
}
@Override
public void onClick(View view) {
Uri uri = Uri.parse("http://www.baidu.com"); //设置要操作的路径
Intent it = new Intent();
it.setAction(Intent.ACTION_VIEW); //设置要操作的Action
it.setData(uri); //要设置的数据
startActivity(it); //执行跳转
}
}

Android APP通过浏览器打开网页