1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.example.android.skeletonapp;
18
19import android.app.Activity;
20import android.os.Bundle;
21import android.view.KeyEvent;
22import android.view.Menu;
23import android.view.MenuItem;
24import android.view.View;
25import android.view.View.OnClickListener;
26import android.widget.Button;
27import android.widget.EditText;
28
29/**
30 * This class provides a basic demonstration of how to write an Android
31 * activity. Inside of its window, it places a single view: an EditText that
32 * displays and edits some internal text.
33 */
34public class SkeletonActivity extends Activity {
35
36    static final private int BACK_ID = Menu.FIRST;
37    static final private int CLEAR_ID = Menu.FIRST + 1;
38
39    private EditText mEditor;
40
41    public SkeletonActivity() {
42    }
43
44    /** Called with the activity is first created. */
45    @Override
46    public void onCreate(Bundle savedInstanceState) {
47        super.onCreate(savedInstanceState);
48
49        // Inflate our UI from its XML layout description.
50        setContentView(R.layout.skeleton_activity);
51
52        // Find the text editor view inside the layout, because we
53        // want to do various programmatic things with it.
54        mEditor = (EditText) findViewById(R.id.editor);
55
56        // Hook up button presses to the appropriate event handler.
57        ((Button) findViewById(R.id.back)).setOnClickListener(mBackListener);
58        ((Button) findViewById(R.id.clear)).setOnClickListener(mClearListener);
59
60        mEditor.setText(getText(R.string.main_label));
61    }
62
63    /**
64     * Called when the activity is about to start interacting with the user.
65     */
66    @Override
67    protected void onResume() {
68        super.onResume();
69    }
70
71    /**
72     * Called when your activity's options menu needs to be created.
73     */
74    @Override
75    public boolean onCreateOptionsMenu(Menu menu) {
76        super.onCreateOptionsMenu(menu);
77
78        // We are going to create two menus. Note that we assign them
79        // unique integer IDs, labels from our string resources, and
80        // given them shortcuts.
81        menu.add(0, BACK_ID, 0, R.string.back).setShortcut('0', 'b');
82        menu.add(0, CLEAR_ID, 0, R.string.clear).setShortcut('1', 'c');
83
84        return true;
85    }
86
87    /**
88     * Called right before your activity's option menu is displayed.
89     */
90    @Override
91    public boolean onPrepareOptionsMenu(Menu menu) {
92        super.onPrepareOptionsMenu(menu);
93
94        // Before showing the menu, we need to decide whether the clear
95        // item is enabled depending on whether there is text to clear.
96        menu.findItem(CLEAR_ID).setVisible(mEditor.getText().length() > 0);
97
98        return true;
99    }
100
101    /**
102     * Called when a menu item is selected.
103     */
104    @Override
105    public boolean onOptionsItemSelected(MenuItem item) {
106        switch (item.getItemId()) {
107        case BACK_ID:
108            finish();
109            return true;
110        case CLEAR_ID:
111            mEditor.setText("");
112            return true;
113        }
114
115        return super.onOptionsItemSelected(item);
116    }
117
118    /**
119     * A call-back for when the user presses the back button.
120     */
121    OnClickListener mBackListener = new OnClickListener() {
122        public void onClick(View v) {
123            finish();
124        }
125    };
126
127    /**
128     * A call-back for when the user presses the clear button.
129     */
130    OnClickListener mClearListener = new OnClickListener() {
131        public void onClick(View v) {
132            mEditor.setText("");
133        }
134    };
135}
136