Merge pull request #1038 from huanxuaner/master

#5 #25 第5次实验
hzuapps · Nov 18, 2020 · e2f2e99 · e2f2e99
2 parents 72a7e35 + fb78eae
commit e2f2e99
Showing 1 changed file with 32 additions and 8 deletions.
diff --git a/students/net1814080903109/LightenActivity.java b/students/net1814080903109/LightenActivity.java
@@ -1,14 +1,22 @@
 package edu.hzuapps.androidlabs.net1814080903109;
 
+import android.content.ContentResolver;
+import android.net.Uri;
 import android.os.Bundle;
+import android.provider.Settings;
+import android.view.Window;
 import android.view.WindowManager;
 import android.widget.SeekBar;
 import android.widget.SeekBar.OnSeekBarChangeListener;
 import android.widget.TextView;
 
 import androidx.appcompat.app.AppCompatActivity;
 
+
+
 public class LightenActivity extends AppCompatActivity {
+
+
     private SeekBar seekbar=null;
     private TextView light=null;
     @Override
@@ -25,25 +33,41 @@ public class SeekBarChangeListenerImp implements OnSeekBarChangeListener{
 
         public void onProgressChanged(SeekBar seekBar, int progress,
                                       boolean fromUser) {
-// TODO Auto-generated method stub
+
             float cur=seekBar.getProgress();
-            LightenActivity.this.setScreenBrightness(cur/100);
+            LightenActivity.this.setScreenBrightness(cur);
             LightenActivity.this.light.setText("当前屏幕亮度:"+cur/100);
         }
 
         public void onStartTrackingTouch(SeekBar seekBar) {
-// TODO Auto-generated method stub
+
         }
 
         public void onStopTrackingTouch(SeekBar seekBar) {
-// TODO Auto-generated method stub
+
         }
     }
-    //设置屏幕亮度的函数
+
+    //改变当前页面亮度
     private void setScreenBrightness(float num){
-        WindowManager.LayoutParams layoutParams=super.getWindow().getAttributes();
-        layoutParams.screenBrightness=num;//设置屏幕的亮度
+        Window localWindow = getWindow();
+        WindowManager.LayoutParams localLayoutParams = localWindow.getAttributes();
+        float f = num / 255.0F;
+        localLayoutParams.screenBrightness = f;
+        localWindow.setAttributes(localLayoutParams);
+        saveBrightness(getContentResolver(), (int) num);
+    }
 
-        super.getWindow().setAttributes(layoutParams);
+    //将当前页面亮度同步至系统亮度
+    public static void saveBrightness(ContentResolver resolver, int brightness) {
+        //改变系统的亮度值
+        //设置为手动调节模式
+        Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS_MODE,
+                Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL);
+        //保存到系统中
+        Uri uri = android.provider.Settings.System.getUriFor(Settings.System.SCREEN_BRIGHTNESS);
+        android.provider.Settings.System.putInt(resolver, Settings.System.SCREEN_BRIGHTNESS, brightness);
+        resolver.notifyChange(uri, null);
     }
+
 }