1/*
2 * Copyright (C) 2006 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.android.largeassettest;
18
19import android.app.Activity;
20import android.content.Context;
21import android.content.res.AssetManager;
22import android.os.AsyncTask;
23import android.os.Bundle;
24import android.util.Log;
25import android.view.View;
26import android.widget.Button;
27import android.widget.TextView;
28
29import java.io.InputStream;
30import java.io.IOException;
31
32/**
33 * Skeleton to test large-asset handling.  The asset in question is one million
34 * four-byte integers, in ascending numeric order.
35 */
36public class LargeAssetTest extends Activity {
37    Button mValidateButton;
38    TextView mResultText;
39    Validator mValidateThread;
40
41    @Override
42    protected void onCreate(Bundle icicle) {
43        super.onCreate(icicle);
44        setContentView(R.layout.lat);
45
46        mResultText = (TextView) findViewById(R.id.result);
47        mValidateButton = (Button) findViewById(R.id.validate);
48
49        mValidateButton.setOnClickListener(mClickListener);
50    }
51
52    View.OnClickListener mClickListener = new View.OnClickListener() {
53        public void onClick(View v) {
54            mValidateButton.setEnabled(false);
55            mValidateThread = new Validator();
56            mValidateThread.execute(LargeAssetTest.this.getAssets());
57        }
58    };
59
60    /**
61     * Validation happens in a separate thread
62     */
63    class Validator extends AsyncTask<AssetManager, Integer, Boolean> {
64        static final String TAG = "Validator";
65
66        @Override
67        protected Boolean doInBackground(AssetManager... params) {
68            AssetManager am = params[0];
69            try {
70                InputStream is = am.open("million-ints", AssetManager.ACCESS_STREAMING);
71                byte[] buf = new byte[4];
72
73                for (int i = 0; i < 1000000; i++) {
74                    int num = is.read(buf, 0, 4);
75                    if (num != 4) {
76                        Log.e(TAG, "Wanted 4 bytes but read " + num);
77                        return false;
78                    }
79                    // the byte array is stored in the asset in little-endian order
80                    int value = (buf[3] << 24) + ((buf[2] & 0xFF) << 16)
81                            + ((buf[1] & 0xFF) << 8) + (buf[0] & 0xFF);
82                    if (value != i) {
83                        Log.e(TAG, "Mismatch: index " + i + " : value " + value);
84                        return false;
85                    }
86                }
87
88                is.close();
89            } catch (IOException e) {
90                Log.w(TAG, "Couldn't open asset", e);
91                return false;
92            }
93            Log.i(TAG, "Finished, reporting valid");
94            return true;
95        }
96
97        @Override
98        protected void onPostExecute(Boolean result) {
99            CharSequence text = (result) ? "Valid!" : "NOT VALID";
100            mResultText.setText(text);
101            mValidateButton.setEnabled(true);
102        }
103    }
104}
105