一、ZXing
ZXing ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages.
https://github.com/zxing/zxing
android-zxingLibrary 几行代码快速集成二维码扫描功能
https://github.com/yipianfengye/android-zxingLibrary
可打开默认二维码扫描页面
支持对图片Bitmap的扫描功能
支持对UI的定制化操作
支持对条形码的扫描功能
支持生成二维码操作
支持控制闪光灯开关
1、拍摄识别二维码
1.依赖
compile 'cn.yipianfengye.android:zxing-library:2.2'
2.权限
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.INTERNET" />
3.初始化
public class App extends Application {
@Override
public void onCreate() {
super.onCreate();
ZXingLibrary.initDisplayOpinion(this);
}
}
4.mainfest中配置app
<application
android:name=".App"
5.拍摄二维码进行识别
Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivityForResult(intent, REQUEST_CODE);
6.扫描结果
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQ_CODE) {
if (resultCode == RESULT_OK) {
if (data != null) {
Bundle bundle = data.getExtras();
if (bundle != null) {
int type = bundle.getInt(CodeUtils.RESULT_TYPE);
if (type == CodeUtils.RESULT_SUCCESS) {
String str = bundle.getString(CodeUtils.RESULT_STRING);
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
}
}
}
}
}
2、解析手机本地二维码
1.依赖
如上
2.权限
如上
3.初始化
如上
4.mainfest中配置app.
如上
5.manifest中app新加
android:requestLegacyExternalStorage="true"
6.选取图片
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(intent, REQUEST_IMAGE);
7.扫描结果
if (requestCode == REQUEST_IMAGE) {
if (resultCode == RESULT_OK) {
if (data != null) {
Uri uri = data.getData();
String path = FileUtil.getFilePathByUri(getApplicationContext(), uri);
CodeUtils.analyzeBitmap(path, new CodeUtils.AnalyzeCallback() {
@Override
public void onAnalyzeSuccess(Bitmap mBitmap, String result) {
Toast.makeText(MainActivity.this, "解析结果:" + result, Toast.LENGTH_LONG).show();
}
@Override
public void onAnalyzeFailed() {
Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show();
}
});
}
}
}
FileUtil.java
public class FileUtil {
public static String getFilePathByUri(Context context, Uri uri) {
if ("content".equalsIgnoreCase(uri.getScheme())) {
int sdkVersion = Build.VERSION.SDK_INT;
if (sdkVersion >= 19) {
return getRealPathFromUriAboveApi19(context, uri);
}
}
return null;
}
@SuppressLint("NewApi")
private static String getRealPathFromUriAboveApi19(Context context, Uri uri) {
String filePath = null;
if (DocumentsContract.isDocumentUri(context, uri)) {
// 如果是document类型的 uri, 则通过document id来进行处理
String documentId = DocumentsContract.getDocumentId(uri);
if (isMediaDocument(uri)) { // MediaProvider
// 使用':'分割
String type = documentId.split(":")[0];
String id = documentId.split(":")[1];
String selection = MediaStore.Images.Media._ID + "=?";
String[] selectionArgs = {id};
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
filePath = getDataColumn(context, contentUri, selection, selectionArgs);
}
}
return filePath;
}
private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
String path = null;
String[] projection = new String[]{MediaStore.Images.Media.DATA};
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
int columnIndex = cursor.getColumnIndexOrThrow(projection[0]);
path = cursor.getString(columnIndex);
}
} catch (Exception e) {
if (cursor != null) {
cursor.close();
}
}
return path;
}
private static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
}
3、生成二维码
1.准备工作
如上
2.
private void generateErWeiMa() {
String str = "wangxianbing";
ImageView imageView = findViewById(R.id.image_view);
// Bitmap mBitmap = CodeUtils.createImage(str, 400, 400, null);
Bitmap mBitmap = CodeUtils.createImage(str, 400, 400, BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
imageView.setImageBitmap(mBitmap);
}
二、LeakCanary
LeakCanary is a memory leak detection library for Android.
https://github.com/square/leakcanary
LeakCanary automatically detects leaks of the following objects:
-destroyed Activity instances
-destroyed Fragment instances
-destroyed fragment View instances
-cleared ViewModel instances
1.依赖
debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.5'
2.在第一个activity中添加点击事件，点击按钮后打开第二个activity
3.新建一个管理类，模拟管擦着模式
public class Manager {
private static Manager sManager = new Manager();
private Manager(){}
public static Manager getInstance() {
return sManager;
}
List<Callback> mList = new ArrayList<>();
public void register(Callback callback) {
mList.add(callback);
}
public void unregister(Callback callback) {
mList.remove(callback);
}
public static interface Callback {}
}
4.在第二个Activity的onCreate中调用Manager.getInstance().register(this);
5.连续几次打开第二个Activity，查看LeakCanary
图片.png
