Button的使用(三):处理点击事件

点击时，打开网页

Uri uri = Uri.parse(urlText.getText().toString());

Intent intent = new Intent(Intent.ACTION_VIEW, uri);

startActivity(intent);

uri输入应该要合法

package com.example.androidtest;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.content.Intent;
import android.net.Uri;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnKeyListener;
import android.widget.EditText;
import android.widget.Button;

public class MainActivity extends Activity {

private EditText urlText;
private Button goButton;

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

urlText = (EditText)findViewById(R.id.url_field);
goButton = (Button)findViewById(R.id.go_button);

goButton.setOnClickListener(new OnClickListener() {
public void onClick(View v)
{
openBrowser();
}
});

urlText.setOnKeyListener(new OnKeyListener() {
public boolean onKey(View view, int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_ENTER) {
openBrowser();
return true;
}

return false;
}
});

}

private void openBrowser()
{
Uri uri = Uri.parse(urlText.getText().toString());
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);
}
}



xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/url_field"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1.0"
android:lines="1" />
<Button
android:id="@+id/go_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/go_button" />
</LinearLayout>
<WebView
android:id="@+id/web_view"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1.0" />
</LinearLayout>