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法律研究如何在Android中根據地址查詢經緯度？
此示例演示瞭如何在Android中根據地址查詢經緯度。
步驟 1 − 在Android Studio中建立一個新專案，轉到檔案 ⇒ 新建專案，並填寫所有必需的詳細資訊以建立新專案。
步驟 2 − 將以下程式碼新增到res/layout/activity_main.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:padding="16sp" tools:context=".MainActivity"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Enter Address" android:id="@+id/textViewAddress" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_alignParentStart="true" /> <EditText android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/editTextAddress" android:layout_alignParentTop="true" android:layout_toEndOf="@+id/textViewAddress" android:singleLine="true" android:text="" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Show Lat/Long" android:id="@+id/addressButton" android:layout_below="@+id/textViewAddress" android:layout_toEndOf="@+id/textViewAddress" android:layout_marginTop="50dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceLarge" android:text="" android:id="@+id/latLongTV" android:layout_centerVertical="true" android:layout_toEndOf="@+id/textViewAddress" /> </RelativeLayout>
步驟 3 − 將以下程式碼新增到src/MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button addressButton;
TextView textViewAddress;
TextView textViewLatLong;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textViewAddress = findViewById(R.id.textViewAddress);
textViewLatLong = findViewById(R.id.latLongTV);
addressButton = findViewById(R.id.addressButton);
addressButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
EditText editText = findViewById(R.id.editTextAddress);
String address = editText.getText().toString();
GeoCodingLocation locationAddress = new GeoCodingLocation();
locationAddress.getAddressFromLocation(address, getApplicationContext(), new
GeoCoderHandler());
}
});
}
private class GeoCoderHandler extends Handler {
@Override
public void handleMessage(Message message) {
String locationAddress;
switch (message.what) {
case 1:
Bundle bundle = message.getData();
locationAddress = bundle.getString("address");
break;
default:
locationAddress = null;
}
textViewLatLong.setText(locationAddress);
}
}
}步驟 4 − 建立一個java類(GeoCodeLocation.java)並新增以下程式碼 −
import android.content.Context;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import java.io.IOException;
import java.util.List;
import java.util.Locale;
class GeoCodeLocation {
private static final String TAG = "GeoCodeLocation";
public static void getAddressFromLocation(final String
locationAddress,
final Context
context, final Handler handler) {
Thread thread = new Thread() {
@Override
public void run() {
Geocoder geocoder = new Geocoder(context,
Locale.getDefault());
String result = null;
try {
List addressList = geocoder.getFromLocationName(locationAddress, 1);
if (addressList != null && addressList.size() > 0) {
Address address = (Address)
addressList.get(0);
StringBuilder sb = new StringBuilder();
sb.append(address.getLatitude()).append("
");
sb.append(address.getLongitude()).append("
");
result = sb.toString();
}
} catch (IOException e) {
Log.e(TAG, "Unable to connect to Geocoder", e);
} finally {
Message message = Message.obtain();
message.setTarget(handler);
if (result != null) {
message.what = 1;
Bundle bundle = new Bundle();
result = "Address: " + locationAddress +
"
Latitude and Longitude
:
" + result;
bundle.putString("address", result);
message.setData(bundle);
} else {
message.what = 1;
Bundle bundle = new Bundle();
result = "Address: " + locationAddress +
"
Unable to get Latitude and
Longitude for this address location.";
bundle.putString("address", result);
message.setData(bundle);
}
message.sendToTarget();
}
}
};
thread.start();
}
}步驟 5 − 將以下程式碼新增到androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.INTERNET" /> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
讓我們嘗試執行您的應用程式。我假設您已將您的實際Android移動裝置連線到您的計算機。要從Android Studio執行應用程式，請開啟專案中的一個活動檔案，然後單擊工具欄中的執行
圖示。選擇您的移動裝置作為選項，然後檢查您的移動裝置，它將顯示您的預設螢幕 −
更新於：2020年7月2日
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