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 
17 package com.android.largeassettest;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.content.res.AssetManager;
22 import android.os.AsyncTask;
23 import android.os.Bundle;
24 import android.util.Log;
25 import android.view.View;
26 import android.widget.Button;
27 import android.widget.TextView;
28 
29 import java.io.InputStream;
30 import 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  */
36 public class LargeAssetTest extends Activity {
37     Button mValidateButton;
38     TextView mResultText;
39     Validator mValidateThread;
40 
41     @Override
onCreate(Bundle icicle)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
doInBackground(AssetManager... params)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
onPostExecute(Boolean result)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