正文
Android-HttpClient-Get请求获取网络图片设置壁纸
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第一种方式使用httpclient-*.jar (需要在网上去下载httpclient-*.jar包)
把httpclient-4.5.jar/httpclient-4.4.1.jar包放入到libs里，然后点击sync project ...才能使用httpclient-4.5.jar包
httpclient-4.5.jar不好用，建议使用httpclient-4.4.1.jar
第二种方式：配置AndroidStudio 的方式获取 HttpClient
在相应的module下的build.gradle中加入：useLibrary 'org.apache.http.legacy'
这条语句一定要加在 android{ } 当中，然后rebulid
例如：
app/build.gradle android { useLibrary 'org.apache.http.legacy' }
apply plugin: 'com.android.application'
android {
compileSdkVersion 28
defaultConfig {
applicationId "liudeli.async"
minSdkVersion 21
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
useLibrary 'org.apache.http.legacy'
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
在AndroidManifest.xml加入权限：
<!-- 访问网络是危险的行为 所以需要权限 -->
<uses-permission android:name="android.permission.INTERNET" /> <!-- 设置壁纸是危险的行为 所以需要权限 -->
<uses-permission android:name="android.permission.SET_WALLPAPER" />
MainActivity5：
package liudeli.async; import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast; import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.HttpResponse; import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection; public class MainActivity5 extends Activity { private final static String TAG = MainActivity5.class.getSimpleName(); // 图片地址
private final String PATH = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000" +
"&sec=1544714792699&di=3c2de372608ed6323f583f1c1b445e51&imgtype=0&src=http%3A%2F%2Fp" +
"2.qhimgs4.com%2Ft0105d27180a686e91f.jpg"; private ImageView imageView;
private Button bt_set_wallpaper;
private ProgressDialog progressDialog; @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(R.layout.activity_main4); imageView = findViewById(R.id.iv_image);
bt_set_wallpaper = findViewById(R.id.bt_set_wallpaper); Button bt_get_image = findViewById(R.id.bt_get_image);
bt_get_image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 让异步任务执行耗时操作
new DownloadImage().execute(PATH);
}
}); bt_set_wallpaper.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (null != bitmap) {
try {
setWallpaper(bitmap);
Toast.makeText(MainActivity5.this, "壁纸设置成功", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity5.this, "壁纸设置失败", Toast.LENGTH_LONG).show();
}
}
}
});
} private Bitmap bitmap; class DownloadImage extends AsyncTask<String, Void, Object> { /**
* 执行耗时操作前执行
*/
@Override
protected void onPreExecute() {
super.onPreExecute();
// 弹出进度条
progressDialog = new ProgressDialog(MainActivity5.this);
progressDialog.setMessage("Download ...");
progressDialog.show();
} /**
* 执行耗时操作
* @param strings
* @return
*/
@Override
protected Object doInBackground(String... strings) {
try { /**
* 第一步
* HttpClient是接口 不能直接实例化，需要通过HttpClient接口的子类 DefaultHttpClient来实例化
*/
HttpClient httpClient = new DefaultHttpClient(); /**
* 第三步
* 实例化HttpGet对象，Get请求方式，应该说是请求对象
*/
HttpUriRequest getRequest = new HttpGet(PATH); /**
* 第二步
* 执行任务
*/
HttpResponse response = httpClient.execute(getRequest); /**
* 第四步
* 判断请求码 是否请求成功
*/
int responseCode = response.getStatusLine().getStatusCode();
Log.d(TAG, "responseCode:" + responseCode);
if (HttpURLConnection.HTTP_OK == responseCode) {
/**
* 第五步
* 获取到服务区响应的字节流数据 然后转换成图片Bitmap数据
*/
InputStream inputStream = response.getEntity().getContent();
bitmap = BitmapFactory.decodeStream(inputStream);
return bitmap;
} } catch (Exception e) {
e.printStackTrace();
}
return null;
} /**
* 耗时执行过程中 更新进度条刻度操作
* @param values
*/
@Override
protected void onProgressUpdate(Void... values) {
super.onProgressUpdate(values);
} /**
* 耗时操作执行完成，用于更新UI
* @param o
*/
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o); if (o != null) { // 成功
bitmap = (Bitmap) o; // 故意放慢两秒，模仿网络差的效果
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
// 设置从网上下载的图片
imageView.setImageBitmap(bitmap);
// 设置为可以点击
bt_set_wallpaper.setEnabled(true); // 关闭进度条
progressDialog.dismiss();
}
}, 2000);
} else { //失败
bt_set_wallpaper.setEnabled(false);
Toast.makeText(MainActivity5.this, "下载失败,请检查原因", Toast.LENGTH_LONG).show();
// 关闭进度条
progressDialog.dismiss();
}
}
}
}
activity_layout5.xml :
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"> <Button
android:id="@+id/bt_get_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="获取图片"
android:onClick="getImage"
android:layout_marginLeft="20dp"
/> <Button
android:id="@+id/bt_set_wallpaper"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="设置壁纸"
android:layout_alignParentRight="true"
android:layout_marginRight="20dp"
android:enabled="false"
/> <ImageView
android:id="@+id/iv_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/bt_get_image" /> </RelativeLayout>
操作结果：
