方式一：
安卓和 H5 互相调用方法
mWebView.loadUrl("http://123.57.60.91/DesayTestDemo/testImgupload.html");
//在js中调用本地java方法
mWebView.addJavascriptInterface(new JsInterface(this), "jsonObject");
webview 加载 H5 链接，添加自定义 JavascriptInterface.
private class JsInterface {
private Context mContext;
public JsInterface(Context context) {
this.mContext = context;
}
//在js中调用jsonObject.getImage()，便会触发此方法。
//拍照
@JavascriptInterface
public void getImage() {
Log.e("Log", "h5进行调用");
//在这里做具体安卓原生拍照，相册代码
}
}
安卓原生拿到图片后，对图片进行压缩，压缩在 100K 左右，然后进行 base64 编码，将图片编码为 base64 的字符串。然后调用
String url = "javascript:" + "uploadImg('" + "data:image/jpeg;base64," + base64str + "')";
mWebView.loadUrl(url);
将 base64 字符串传递给 H5 页面。
方式二：
H5 通过写 标签，安卓重写方法。
public class H5Demo extends AppCompatActivity {
private WebView mWebview;
private static final String TAG = MainActivity.class.getSimpleName();
private String mCM;
private ValueCallback mUM;
private ValueCallback mUMA;
private final static int FCR = 1;
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
if (Build.VERSION.SDK_INT >= 21) {
Uri[] results = null;
//Check if response is positive
if (resultCode == Activity.RESULT_OK) {
if (requestCode == FCR) {
if (null == mUMA) {
return;
}
if (intent == null) {
//Capture Photo if no image available
if (mCM != null) {
results = new Uri[]{Uri.parse(mCM)};
}
} else {
String dataString = intent.getDataString();
if (dataString != null) {
results = new Uri[]{Uri.parse(dataString)};
}
}
}
}
mUMA.onReceiveValue(results);
mUMA = null;
} else {
if (requestCode == FCR) {
if (null == mUM) return;
Uri result = null;
if (intent == null) {
//Capture Photo if no image available
if (mCM != null) {
result = Uri.parse(mCM);
}
} else {
result = intent == null || resultCode != RESULT_OK ? null : intent.getData();
}
mUM.onReceiveValue(result);
mUM = null;
}
}
}
@SuppressLint({"SetJavaScriptEnabled", "WrongViewCast"})
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_h5_demo);
if (Build.VERSION.SDK_INT >= 23 && (ContextCompat.checkSelfPermission(this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)) {
ActivityCompat.requestPermissions(H5Demo.this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.CAMERA}, 1);
}
mWebview = (WebView) findViewById(R.id.webview);
assert mWebview != null;
WebSettings webSettings = mWebview.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
if (Build.VERSION.SDK_INT >= 21) {
webSettings.setMixedContentMode(0);
mWebview.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else if (Build.VERSION.SDK_INT >= 19) {
mWebview.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else if (Build.VERSION.SDK_INT < 19) {
mWebview.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
mWebview.setWebViewClient(new Callback());
mWebview.loadUrl("http://123.57.60.91/DesayTestDemo/testImgupload.html");
mWebview.setWebChromeClient(new WebChromeClient() {
//For Android 3.0+
public void openFileChooser(ValueCallback uploadMsg) {
mUM = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
// i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
H5Demo.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FCR);
}
// For Android 3.0+, above method not supported in some android 3+ versions, in such case we use this
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUM = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
// i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
H5Demo.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FCR);
}
//For Android 4.1+
public void openFileChooser(ValueCallback uploadMsg, String acceptType, String capture) {
mUM = uploadMsg;
File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "TestApp");
if (!imageStorageDir.exists()) {
imageStorageDir.mkdirs();
}
File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
mCM = "file:" + file.getAbsolutePath();
Uri imageUri = Uri.fromFile(file); // save to the private variable
final Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
Intent Photo = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent, Photo});
startActivityForResult(chooserIntent, H5Demo.FCR);
}
//For Android 5.0+
public boolean onShowFileChooser(
WebView webView, ValueCallback filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
if (mUMA != null) {
mUMA.onReceiveValue(null);
}
mUMA = filePathCallback;
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(H5Demo.this.getPackageManager()) != null) {
File photoFile = null;
try {
photoFile = createImageFile();
takePictureIntent.putExtra("PhotoPath", mCM);
} catch (IOException ex) {
Log.e(TAG, "Image file creation failed", ex);
}
if (photoFile != null) {
mCM = "file:" + photoFile.getAbsolutePath();
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
} else {
takePictureIntent = null;
}
}
Intent contentSelectionIntent = new Intent(Intent.ACTION_GET_CONTENT);
// contentSelectionIntent.addCategory(Intent.CATEGORY_OPENABLE);
contentSelectionIntent.setType("image/*");
Intent[] intentArray;
if (takePictureIntent != null) {
intentArray = new Intent[]{takePictureIntent};
} else {
intentArray = new Intent[0];
}
Intent chooserIntent = new Intent(Intent.ACTION_CHOOSER);
chooserIntent.putExtra(Intent.EXTRA_INTENT, contentSelectionIntent);
chooserIntent.putExtra(Intent.EXTRA_TITLE, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentArray);
startActivityForResult(chooserIntent, FCR);
return true;
}
});
}
public class Callback extends WebViewClient {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(getApplicationContext(), "Failed loading app!", Toast.LENGTH_SHORT).show();
}
}
// Create an image file
private File createImageFile() throws IOException {
@SuppressLint("SimpleDateFormat") String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "img_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
return File.createTempFile(imageFileName, ".jpg", storageDir);
}
@Override
public boolean onKeyDown(int keyCode, @NonNull KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mWebview.canGoBack()) {
mWebview.goBack();
} else {
finish();
}
return true;
}
}
return super.onKeyDown(keyCode, event);
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
}