src/ui/BackgroundManager.java

@@ -0,0 +1,131 @@
+package net.micode.notes.ui;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.preference.PreferenceManager;
+import android.widget.Toast;
+import android.view.View;
+
+import net.micode.notes.R;
+
+import java.io.InputStream;
+
+public class BackgroundManager {
+    public static final int REQUEST_CODE_PICK_IMAGE = 2001;
+
+    private static final String PREF_BG_TYPE = "pref_bg_type"; // 0=color,1=builtin,2=uri
+    private static final String PREF_BG_COLOR = "pref_bg_color";
+    private static final String PREF_BG_RES_ID = "pref_bg_res_id";
+    private static final String PREF_BG_URI = "pref_bg_uri";
+
+    private static final int BG_TYPE_COLOR = 0;
+    private static final int BG_TYPE_BUILTIN = 1;
+    private static final int BG_TYPE_URI = 2;
+
+    private Activity mActivity;
+    private View mRootView;
+
+    public BackgroundManager(Activity activity, int rootViewId) {
+        mActivity = activity;
+        mRootView = activity.findViewById(rootViewId);
+        if (mRootView == null) {
+            mRootView = activity.getWindow().getDecorView();
+        }
+    }
+
+    public void applyBackgroundFromPrefs() {
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity);
+        int type = sp.getInt(PREF_BG_TYPE, -1);
+        if (type == BG_TYPE_COLOR) {
+            int color = sp.getInt(PREF_BG_COLOR, 0xFFFFFFFF);
+            applyColorBackground(color);
+        } else if (type == BG_TYPE_BUILTIN) {
+            int resId = sp.getInt(PREF_BG_RES_ID, R.drawable.list_background);
+            applyBuiltinBackground(resId);
+        } else if (type == BG_TYPE_URI) {
+            String uriStr = sp.getString(PREF_BG_URI, null);
+            if (uriStr != null) {
+                applyUriBackground(Uri.parse(uriStr));
+            }
+        } else {
+            mRootView.setBackgroundResource(R.drawable.list_background);
+        }
+    }
+
+    public void applyColorAndSave(int color) {
+        applyColorBackground(color);
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity);
+        sp.edit().putInt(PREF_BG_TYPE, BG_TYPE_COLOR).putInt(PREF_BG_COLOR, color).commit();
+    }
+
+    public void applyBuiltinAndSave(int resId) {
+        applyBuiltinBackground(resId);
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity);
+        sp.edit().putInt(PREF_BG_TYPE, BG_TYPE_BUILTIN).putInt(PREF_BG_RES_ID, resId).commit();
+    }
+
+    public void pickImageFromGallery() {
+        Intent intent = new Intent(Intent.ACTION_PICK);
+        intent.setType("image/*");
+        mActivity.startActivityForResult(intent, REQUEST_CODE_PICK_IMAGE);
+    }
+
+    public boolean handleActivityResult(int requestCode, int resultCode, Intent data) {
+        if (requestCode == REQUEST_CODE_PICK_IMAGE && resultCode == Activity.RESULT_OK && data != null) {
+            Uri uri = data.getData();
+            if (uri != null) {
+                applyUriAndSave(uri);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    public void resetToDefaultAndClear() {
+        mRootView.setBackgroundResource(R.drawable.list_background);
+        SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity);
+        sp.edit().remove(PREF_BG_TYPE).remove(PREF_BG_COLOR).remove(PREF_BG_RES_ID).remove(PREF_BG_URI).commit();
+    }
+
+    private void applyColorBackground(int color) {
+        mRootView.setBackgroundColor(color);
+    }
+
+    private void applyBuiltinBackground(int resId) {
+        mRootView.setBackgroundResource(resId);
+    }
+
+    private void applyUriBackground(Uri uri) {
+        try {
+            InputStream is = mActivity.getContentResolver().openInputStream(uri);
+            if (is != null) {
+                Drawable d = Drawable.createFromStream(is, uri.toString());
+                mRootView.setBackgroundDrawable(d);
+                is.close();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            Toast.makeText(mActivity, "无法加载图片", Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private void applyUriAndSave(Uri uri) {
+        try {
+            InputStream is = mActivity.getContentResolver().openInputStream(uri);
+            if (is != null) {
+                Drawable d = Drawable.createFromStream(is, uri.toString());
+                mRootView.setBackgroundDrawable(d);
+                is.close();
+                SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(mActivity);
+                sp.edit().putInt(PREF_BG_TYPE, BG_TYPE_URI).putString(PREF_BG_URI, uri.toString()).commit();
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            Toast.makeText(mActivity, "无法加载图片", Toast.LENGTH_SHORT).show();
+        }
+    }
+}

src/ui/NotesListActivity.java

@@ -59,7 +59,7 @@ import android.widget.ListView;
 import android.widget.PopupMenu;
 import android.widget.TextView;
 import android.widget.Toast;
-
+import net.micode.notes.ui.BackgroundManager;
 import net.micode.notes.R;
 import net.micode.notes.data.Notes;
 import net.micode.notes.data.Notes.NoteColumns;
@@ -72,6 +72,12 @@ import net.micode.notes.ui.NotesListAdapter.AppWidgetAttribute;
 import net.micode.notes.widget.NoteWidgetProvider_2x;
 import net.micode.notes.widget.NoteWidgetProvider_4x;
 
+import android.net.Uri;
+import android.app.Activity;
+import android.content.Intent;
+import android.view.Menu;
+import android.view.MenuItem;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
@@ -156,6 +162,10 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
 
     @Override
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {// 处理子活动返回结果
+        //如果是背景管理器的结果，交给背景管理器处理
+        if (mBackgroundManager != null && mBackgroundManager.handleActivityResult(requestCode, resultCode, data)) {
+            return;
+        }
         if (resultCode == RESULT_OK
                 && (requestCode == REQUEST_CODE_OPEN_NODE || requestCode == REQUEST_CODE_NEW_NODE)) {
             mNotesListAdapter.changeCursor(null);
@@ -245,8 +255,62 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
         mTitleBar = (TextView) findViewById(R.id.tv_title_bar);
         mState = ListEditState.NOTE_LIST;
         mModeCallBack = new ModeCallback();
+        //初始化背景管理器
+        mNotesRootView = findViewById(R.id.notes_root);
+                
+        mBackgroundManager = new BackgroundManager(this, R.id.notes_root);
+        mBackgroundManager.applyBackgroundFromPrefs();
+    }
+ //显示背景设置对话框
+    private void showBackgroundSettingsDialog() {
+        final String[] options = new String[] {"纯色背景", "系统内置图片", "从相册选择", "恢复默认"};
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle("选择背景");
+        builder.setItems(options, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                if (which == 0) {
+                    showColorChoiceDialog();
+                } else if (which == 1) {
+                    showBuiltinChoiceDialog();
+                } else if (which == 2) {
+                    if (mBackgroundManager != null) mBackgroundManager.pickImageFromGallery();
+                } else if (which == 3) {
+                    if (mBackgroundManager != null) mBackgroundManager.resetToDefaultAndClear();
+                }
+            }
+        });
+        builder.show();
     }
 
+    private void showColorChoiceDialog() {
+        final int[] colors = new int[] {0xFFFFFFFF, 0xFFFFFFCC, 0xFFFFF0F0, 0xFFE8FFF0, 0xFFDDE8FF};
+        final String[] names = new String[] {"白色", "浅黄", "浅红", "浅绿", "浅蓝"};
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle("选择纯色背景");
+        builder.setItems(names, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                int color = colors[which];
+                if (mBackgroundManager != null) mBackgroundManager.applyColorAndSave(color);
+            }
+        });
+        builder.show();
+    }
+
+    private void showBuiltinChoiceDialog() {
+        final int[] resIds = new int[] {R.drawable.background_1, R.drawable.background_2, R.drawable.background_3, R.drawable.background_4};
+        final String[] names = new String[] {"预设1", "预设2", "预设3", "预设4"};
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setTitle("选择内置背景");
+        builder.setItems(names, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int which) {
+                int resId = resIds[which];
+                if (mBackgroundManager != null) mBackgroundManager.applyBuiltinAndSave(resId);
+            }
+        });
+        builder.show();
+    }
+
+    
     /**
      * 多选模式回调类，处理批量操作和菜单项点击事件
      */
@@ -862,6 +926,11 @@ public class NotesListActivity extends Activity implements OnClickListener, OnIt
                 onSearchRequested();
                 break;
             }
+            //如果是背景设置菜单项
+            case R.id.menu_background_settings: {
+                showBackgroundSettingsDialog();
+                break;
+            }
             default:
                 break;
         }