改进网络图片下载与预览

powerbell/build.properties

@@ -1,8 +1,8 @@
 #Created by .winboll/winboll_app_build.gradle
-#Fri Nov 21 03:21:01 HKT 2025
+#Thu Nov 20 19:36:49 GMT 2025
 stageCount=5
 libraryProject=
 baseVersion=15.11
 publishVersion=15.11.4
-buildCount=0
+buildCount=2
 baseBetaVersion=15.11.5

powerbell/src/main/java/cc/winboll/studio/powerbell/dialogs/NetworkBackgroundDialog.java

@@ -2,11 +2,12 @@ package cc.winboll.studio.powerbell.dialogs;
 
 import android.content.Context;
 import android.graphics.drawable.Drawable;
+import android.os.Handler;
+import android.os.Message;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
-import android.widget.ImageView;
 import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AlertDialog;
@@ -14,9 +15,11 @@ import cc.winboll.studio.libappbase.LogUtils;
 import cc.winboll.studio.libappbase.ToastUtils;
 import cc.winboll.studio.powerbell.R;
 import cc.winboll.studio.powerbell.utils.ImageDownloader;
+import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import cc.winboll.studio.powerbell.views.BackgroundView;
+import android.content.DialogInterface;
 
 /**
  * @Author ZhanGSKen&豆包大模型<zhangsken@qq.com>
@@ -25,17 +28,23 @@ import cc.winboll.studio.powerbell.views.BackgroundView;
  * 继承 AndroidX AlertDialog，绑定自定义布局 dialog_networkbackground.xml
  */
 public class NetworkBackgroundDialog extends AlertDialog {
-	public static final String TAG = "NetworkBackgroundDialog";
+    public static final String TAG = "NetworkBackgroundDialog";
+    // 消息标识：图片加载成功
+    private static final int MSG_IMAGE_LOAD_SUCCESS = 1001;
+    // 消息标识：图片加载失败
+    private static final int MSG_IMAGE_LOAD_FAILED = 1002;
 
     // 控件引用
     private TextView tvTitle;
     private TextView tvContent;
     private Button btnCancel;
     private Button btnConfirm;
-	private Button btnPreview;
+    private Button btnPreview;
-	private EditText etURL;
+    private EditText etURL;
-	BackgroundView bvBackgroundPreview;
+    BackgroundView bvBackgroundPreview;
-	Context mContext;
+    Context mContext;
+    // 主线程 Handler，用于接收子线程消息并更新 UI
+    private Handler mUiHandler;
 
     // 按钮点击回调接口（Java7 接口实现）
     public interface OnDialogClickListener {
@@ -48,21 +57,69 @@ public class NetworkBackgroundDialog extends AlertDialog {
     // Java7 显式构造（必须传入 Context）
     public NetworkBackgroundDialog(@NonNull Context context) {
         super(context);
+        initHandler(); // 初始化 Handler
         initView(); // 初始化布局和控件
+        setDismissListener(); // 设置对话框消失监听
     }
 
     // 带回调的构造（便于外部处理点击事件）
     public NetworkBackgroundDialog(@NonNull Context context, OnDialogClickListener listener) {
         super(context);
         this.listener = listener;
+        initHandler(); // 初始化 Handler
         initView();
+        setDismissListener(); // 设置对话框消失监听
+    }
+
+    /**
+     * 初始化主线程 Handler，用于更新 UI
+     */
+    private void initHandler() {
+        mUiHandler = new Handler() {
+            @Override
+            public void handleMessage(Message msg) {
+                super.handleMessage(msg);
+                // 对话框已消失时，不再处理 UI 消息
+                if (!isShowing()) {
+                    return;
+                }
+                switch (msg.what) {
+                    case MSG_IMAGE_LOAD_SUCCESS:
+                        // 图片加载成功，获取文件路径并设置背景
+                        String filePath = (String) msg.obj;
+                        setBackgroundFromPath(filePath);
+                        break;
+                    case MSG_IMAGE_LOAD_FAILED:
+                        // 图片加载失败，设置默认背景
+                        bvBackgroundPreview.setBackgroundResource(R.drawable.ic_launcher);
+                        ToastUtils.show("图片预览失败，请检查链接");
+                        break;
+                }
+            }
+        };
+    }
+
+    /**
+     * 设置对话框消失监听：移除 Handler 消息，避免内存泄漏
+     */
+    private void setDismissListener() {
+        this.setOnDismissListener(new OnDismissListener() {
+				@Override
+				public void onDismiss(DialogInterface dialog) {
+					// 对话框消失时，移除所有未处理的消息和回调
+					if (mUiHandler != null) {
+						mUiHandler.removeCallbacksAndMessages(null);
+					}
+					LogUtils.d(TAG, "对话框已消失，Handler 消息已清理");
+				}
+			});
     }
 
     /**
      * 初始化布局和控件
      */
     private void initView() {
-		mContext = this.getContext();
+        mContext = this.getContext();
         // 加载自定义布局
         View dialogView = LayoutInflater.from(getContext())
 			.inflate(R.layout.dialog_networkbackground, null);
@@ -74,10 +131,9 @@ public class NetworkBackgroundDialog extends AlertDialog {
         tvContent = (TextView) dialogView.findViewById(R.id.tv_dialog_content);
         btnCancel = (Button) dialogView.findViewById(R.id.btn_cancel);
         btnConfirm = (Button) dialogView.findViewById(R.id.btn_confirm);
-		btnPreview = (Button) dialogView.findViewById(R.id.btn_preview);
+        btnPreview = (Button) dialogView.findViewById(R.id.btn_preview);
-		etURL = (EditText) dialogView.findViewById(R.id.et_url);
+        etURL = (EditText) dialogView.findViewById(R.id.et_url);
-		//webViewPreview = (WebView) dialogView.findViewById(R.id.webview_preview);
+        bvBackgroundPreview = (BackgroundView) dialogView.findViewById(R.id.bv_background_preview);
-		bvBackgroundPreview = (BackgroundView) findViewById(R.id.bv_background_preview);
 
         // 设置按钮点击事件
         setButtonClickListeners();
@@ -116,12 +172,56 @@ public class NetworkBackgroundDialog extends AlertDialog {
 				@Override
 				public void onClick(View v) {
 					LogUtils.d("NetworkBackgroundDialog", "确认预览点击");
-					String url = etURL.getText().toString();
+					String url = etURL.getText().toString().trim();
+					if (url.isEmpty()) {
+						ToastUtils.show("请输入图片链接");
+						return;
+					}
 					ImageDownloader.getInstance(mContext).downloadImage(url, mDownloadCallback);
 				}
 			});
     }
 
+    /**
+     * 根据文件路径设置 BackgroundView 背景（主线程调用）
+     * @param filePath 图片文件路径
+     */
+    private void setBackgroundFromPath(String filePath) {
+        FileInputStream fis = null;
+        try {
+            File imageFile = new File(filePath);
+            if (!imageFile.exists()) {
+                LogUtils.e(TAG, "图片文件不存在：" + filePath);
+                bvBackgroundPreview.setBackgroundResource(R.drawable.ic_launcher);
+                return;
+            }
+
+            fis = new FileInputStream(imageFile);
+            Drawable drawable = Drawable.createFromStream(fis, null);
+            // 设置背景（主线程安全操作）
+            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
+                bvBackgroundPreview.setBackground(drawable);
+            } else {
+                bvBackgroundPreview.setBackgroundDrawable(drawable);
+            }
+            LogUtils.d(TAG, "图片预览成功：" + filePath);
+
+        } catch (Exception e) {
+            e.printStackTrace();
+            bvBackgroundPreview.setBackgroundResource(R.drawable.ic_launcher);
+            LogUtils.e(TAG, "图片预览失败：" + e.getMessage());
+        } finally {
+            // Java7 手动关闭流，避免资源泄漏
+            if (fis != null) {
+                try {
+                    fis.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+    }
+
     /**
      * 对外提供方法：修改对话框标题（灵活适配不同场景）
      */
@@ -147,49 +247,23 @@ public class NetworkBackgroundDialog extends AlertDialog {
         this.listener = listener;
     }
 
-	ImageDownloader.DownloadCallback mDownloadCallback = new ImageDownloader.DownloadCallback(){
+    ImageDownloader.DownloadCallback mDownloadCallback = new ImageDownloader.DownloadCallback() {
+        @Override
+        public void onSuccess(String filePath) {
+            ToastUtils.show("图片下载成功：" + filePath);
+            LogUtils.d(TAG, filePath);
+            // 发送消息到主线程，携带图片路径
+            Message successMsg = mUiHandler.obtainMessage(MSG_IMAGE_LOAD_SUCCESS, filePath);
+            mUiHandler.sendMessage(successMsg);
+        }
 
-		@Override
+        @Override
-		public void onSuccess(String filePath) {
+        public void onFailure(String errorMsg) {
-			ToastUtils.show(filePath);
+            ToastUtils.show("下载失败：" + errorMsg);
-			LogUtils.d(TAG, filePath);
+            LogUtils.e(TAG, errorMsg);
-
+            // 发送图片加载失败消息
-			String imagePath = "/storage/emulated/0/Android/data/cc.winboll.studio.powerbell.beta/files/mmexport1713182627221.png";
+            mUiHandler.sendEmptyMessage(MSG_IMAGE_LOAD_FAILED);
-			//String imagePath = filePath;
+        }
-
+    };
-			FileInputStream fis = null;
-			try {
-				fis = new FileInputStream(imagePath);
-				Drawable drawable = Drawable.createFromStream(fis, null);
-				// 设置背景
-				if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
-					bvBackgroundPreview.setBackground(drawable);
-				} else {
-					bvBackgroundPreview.setBackgroundDrawable(drawable);
-				}
-			} catch (Exception e) {
-				e.printStackTrace();
-				//ivBackgroundPreview.setBackgroundResource(R.drawable.default_error); // 异常时显示默认图
-				bvBackgroundPreview.setBackgroundResource(R.drawable.ic_launcher); // 异常时显示默认图
-			} finally {
-				// Java7 手动关闭流，避免资源泄漏
-				if (fis != null) {
-					try {
-						fis.close();
-					} catch (IOException e) {
-						e.printStackTrace();
-					}
-				}
-			}
-
-		}
-
-		@Override
-		public void onFailure(String errorMsg) {
-			ToastUtils.show(errorMsg);
-			LogUtils.d(TAG, errorMsg);
-		}
-
-	};
 }