New API demo for UndoManager.

Change-Id: Ic49211c771db275f27ceefa5372b005a357fce21
2013-04-26 18:09:32 -07:00
parent 0d73759171
commit f25ca509d5
4 changed files with 141 additions and 0 deletions
--- a/samples/ApiDemos/src/com/example/android/apis/content/TextUndoActivity.java
+++ b/samples/ApiDemos/src/com/example/android/apis/content/TextUndoActivity.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.apis.content;
+
+import android.app.Activity;
+import android.content.UndoManager;
+import android.os.Parcelable;
+import android.view.View;
+import android.widget.Button;
+import com.example.android.apis.R;
+
+import android.os.Bundle;
+import android.widget.TextView;
+
+/**
+ * Simple example of using an UndoManager for editing text in a TextView.
+ */
+public class TextUndoActivity extends Activity {
+    UndoManager mUndoManager;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        mUndoManager = new UndoManager();
+        if (savedInstanceState != null) {
+            Parcelable p = savedInstanceState.getParcelable("undo");
+            if (p != null) {
+                mUndoManager.restoreInstanceState(p);
+            }
+        }
+
+        setContentView(R.layout.text_undo);
+
+        ((TextView)findViewById(R.id.text)).setUndoManager(mUndoManager, "text");
+        ((Button)findViewById(R.id.undo)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mUndoManager.undo(null, 1);
+            }
+        });
+        ((Button)findViewById(R.id.redo)).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                mUndoManager.redo(null, 1);
+            }
+        });
+     }
+
+    @Override
+    protected void onSaveInstanceState(Bundle outState) {
+        super.onSaveInstanceState(outState);
+        outState.putParcelable("undo", mUndoManager.saveInstanceState());
+    }
+}