用户输入一个地址,当查询位置失败时,弹出对话框
package com.example.androidtest;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.net.Uri;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.util.Log;
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final AlertDialog.Builder adb = new AlertDialog.Builder(this);
final EditText addressfield = (EditText)findViewById(R.id.address);
final Button button = (Button)findViewById(R.id.launchmap);
button.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v)
{
try {
String address = addressfield.getText().toString();
address = address.replace(' ', '+');
Intent geoIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("geo:0,0?q=" + address));
startActivity(geoIntent);
} catch (Exception e) {
AlertDialog ad = adb.create();
ad.setMessage("Failed to launch");
ad.show();
}
}
});
}
}
activity_main.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"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Please enter your home address."
/>
<EditText
android:id="@+id/address"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:autoText="true"
/>
<Button
android:id="@+id/launchmap"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Map"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Unlocking Android"
/>
</LinearLayout>