在AndroidManifest.xml配置网络访问权限：
<!-- 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" />
在 app/build.gradle 加入
implementation ‘com.squareup.okhttp3:okhttp:3.10.0‘
然后点击 sync now 下载okhttp支持包
MainActivity
package liudeli.async.okhttp2;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import liudeli.async.R;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class MainActivity extends Activity {
private final static String TAG = MainActivity.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) {
// 弹出进度条
progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setMessage("Download ...");
progressDialog.show();
/**
* 第一种方式下载图片 普通
*/
/*new Thread(){
@Override
public void run() {
super.run();
downloadImage1();
}
}.start();*/
/**
* 第二种方式下载图片 异步
*/
downloadImage2();
}
});
bt_set_wallpaper.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (null != bitmap) {
try {
setWallpaper(bitmap);
Toast.makeText(MainActivity.this, "壁纸设置成功", Toast.LENGTH_LONG).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "壁纸设置失败", Toast.LENGTH_LONG).show();
}
}
}
});
}
private Bitmap bitmap;
/**
* 第一种方式
* 使用okhttp 普通下载图片
*/
private void downloadImage1() {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(PATH)
.build();
try {
Response response = client.newCall(request).execute();
InputStream inputStream = response.body().byteStream();
if (200 == response.code()) {
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
showUI(bitmap);
} else {
showUI(null);
}
} catch (IOException e) {
e.printStackTrace();
showUI(null);
}
}
/**
* 第二种方式
* 使用okhttp 异步下载图片
*/
private void downloadImage2() {
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(PATH)
.build();
try {
Call call = client.newCall(request); // 使用client去请求
call.enqueue(new Callback() { // 回调方法，>>> 可以获得请求结果信息
@Override
public void onFailure(Call call, IOException e) {
showUI(null); // 下载失败，更新UI
}
@Override
public void onResponse(Call call, Response response) throws IOException {
InputStream inputStream = response.body().byteStream();
if (200 == response.code()) {
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
showUI(bitmap);
} else {
showUI(null);
}
}
});
} catch (Exception e) {
e.printStackTrace();
showUI(null);
}
}
/**
* 显示UI 此方法是可以在 主线程 子线程 对UI操作显示的哦
* @param bitmap
*/
private void showUI(final Bitmap bitmap) {
this.bitmap = bitmap;
runOnUiThread(runnable);
}
Runnable runnable = new Runnable() {
@Override
public void run() {
if (bitmap != null) {
// 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();
Toast.makeText(MainActivity.this, "下载成功", Toast.LENGTH_SHORT).show();
}
}, 2000);
} else { //失败
bt_set_wallpaper.setEnabled(false);
Toast.makeText(MainActivity.this, "下载失败,请检查原因", Toast.LENGTH_LONG).show();
// 关闭进度条
progressDialog.dismiss();
}
}
};
}
activity_main
<?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>
执行结果：
原文地址：https://www.cnblogs.com/android-deli/p/10251131.html
时间： 2024-08-08 12:08:59