Java 在Android Studio中使用Web Api检索Json数据
我是Android新手,当我尝试导入时Java 在Android Studio中使用Web Api检索Json数据,java,android,json,Java,Android,Json,我是Android新手,当我尝试导入时 import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; 在MainActivity.java文件中,我无法实现它 我更改了gradle并尝试了另一个jar文件,但它不起作用 这是我的gradle文件: apply plugin
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
在MainActivity.java文件中,我无法实现它
我更改了gradle并尝试了另一个jar文件,但它不起作用
这是我的gradle文件:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.1"
useLibrary 'org.apache.http.legacy'
defaultConfig {
applicationId "net.learn2develop.json"
minSdkVersion 9
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'org.apache.httpcomponents:httpcore:4.3.2'
compile 'org.apache.httpcomponents:httpclient:4.5'
compile 'com.google.code.gson:gson:2.3.1'
}
这是MainActivity.java:
package net.learn2develop.json;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.StatusLine;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
public class MainActivity extends AppCompatActivity {
public String readJSONFeed(String URL) {
StringBuilder stringBuilder = new StringBuilder();
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet;
try {
HttpResponse response = httpClient.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();
BufferedReader reader = new BufferedReader(
new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
stringBuilder.append(line);
}
inputStream.close();
} else {
Log.d("JSON", "Failed to download file");
}
} catch (Exception e) {
Log.d("readJSONFeed", e.getLocalizedMessage());
}
return stringBuilder.toString();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是XML代码:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Latitude" />
<EditText
android:id="@+id/txtLat"
android:layout_width="320dp"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="numberDecimal"
android:text="37.77493" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Longitude" />
<EditText
android:id="@+id/txtLong"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="numberDecimal"
android:text="-122.419416" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Get Weather"
android:onClick="btnGetWeather" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Postal Code" />
<EditText
android:id="@+id/txtPostalCode"
android:layout_width="320dp"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="number"
android:text="89118" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Get Places"
android:onClick="btnGetPlaces" />
</LinearLayout>
sdk 23不再支持HttpClient
。您必须使用URLConnection
或降级到sdk 22(编译'com.android.support:appcompat-v7:22.2.0')
如果您需要sdk 23,请将其添加到gradle中:
android {
useLibrary 'org.apache.http.legacy'
}
您也可以尝试下载并将HttpClient
jar直接包含到您的项目中
你试过compile'com.android.support:appcompat-v7:22.2.0'
compile'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'吗?谢谢你的回答