Java 通过意图捕捉照片
我正在尝试制作“拍照”教程,在完成所有步骤之后,我仍然有一个错误。更确切地说,在我拍完照片后,它会显示信息“相机已停止”。我添加了一个按钮,可以在单击时打开相机,并添加了一个imageView来显示照片。我正在尝试在三星Galaxy S7(Android 8.0.0,API 26)上部署该应用程序 这是setOnClickListener:Java 通过意图捕捉照片,java,android,Java,Android,我正在尝试制作“拍照”教程,在完成所有步骤之后,我仍然有一个错误。更确切地说,在我拍完照片后,它会显示信息“相机已停止”。我添加了一个按钮,可以在单击时打开相机,并添加了一个imageView来显示照片。我正在尝试在三星Galaxy S7(Android 8.0.0,API 26)上部署该应用程序 这是setOnClickListener: protected void onCreate(Bundle savedInstanceState) { super.onCreate(s
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById((R.id.button));
ImageView imageView = (ImageView)findViewById(R.id.imageView);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
button.setEnabled(false);
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0);
}
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakePictureIntent();
}
});
}
这是摄像机的拍摄方法:
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
takePictureIntent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File imageView = null;
try {
imageView = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
ex.printStackTrace();
}
// Continue only if the File was successfully created
if (imageView != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.camapp.fileprovider",
imageView);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
文件路径:
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path
name="my_images"
path="Android/data/com.example.camapp/files/Pictures" />
</paths>
我想制作一个打开相机的按钮,拍摄一张照片并将其保存在gallery或其他指定目录中,因为我将对该照片进行一些图像处理。我尝试了yt上的几乎所有教程,我真的很难找到解决此问题的方法。我感谢您提供的任何解决方案或建议。谢谢您的支持时间 如果您的应用程序要求相机单击图片,则应询问相机权限
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app">
<uses-permission android:name="android.permission.CAMERA"/>
<!-- other permissions go here -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application ...>
...
</application>
还可以在清单文件中定义文件提供程序
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.yourPackageName.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_list"></meta-data>
</provider>
您是否在清单文件中添加了摄像头权限
以及存储权限?正如@RakhiDhavale所建议的,您可能需要更多权限,否则我认为您应该在OnActivityResult()末尾将调用移动到galleryAddPic()确保您的文件存在并包含您的图片。请发布stacktrace@JohnJoe我添加了stacktrace。谢谢你的建议!好的,我在AndroidManifest中添加了“android.permission.CAMERA”权限,现在我单击按钮后,它会显示消息“CAMERA has stopped”,而不启动摄像头。我还在OnActivityResult()的末尾添加了galleryAddPic()。有可能是activity_main.xml中的错误吗?您是否要求用户在拍照之前,单击按钮授予相机和存储权限?如果您是新手,并且在实施过程中遇到问题,请参考此链接请求权限。请参考此教程链接谢谢您的教程!我将再次尝试从那里执行步骤。现在我有权限,但现在我从一开始就遇到了相同的问题。我拍照后,它会显示消息“摄像头已停止”
java.lang.IllegalStateException: @NotNull method com/android/tools/idea/gradle/project/model/AndroidModuleModel.getRootDir must not return null
at com.android.tools.idea.gradle.project.model.AndroidModuleModel.$$$reportNull$$$0(AndroidModuleModel.java)
at com.android.tools.idea.gradle.project.model.AndroidModuleModel.getRootDir(AndroidModuleModel.java:571)
at com.android.tools.idea.gradle.project.sync.setup.module.android.ContentRootsModuleSetupStep.findContentEntries(ContentRootsModuleSetupStep.java:71)
at com.android.tools.idea.gradle.project.sync.setup.module.android.ContentRootsModuleSetupStep.doSetUpModule(ContentRootsModuleSetupStep.java:58)
at com.android.tools.idea.gradle.project.sync.setup.module.android.ContentRootsModuleSetupStep.doSetUpModule(ContentRootsModuleSetupStep.java:41)
at com.android.tools.idea.gradle.project.sync.setup.module.ModuleSetupStep.setUpModule(ModuleSetupStep.java:35)
at com.android.tools.idea.gradle.project.sync.setup.module.common.BaseSetup.setUpModule(BaseSetup.java:41)
at com.android.tools.idea.gradle.project.sync.ng.ModuleSetup.setupModuleModels(ModuleSetup.java:141)
at com.android.tools.idea.gradle.project.sync.ng.CachedProjectModelsSetup.setUpModules(CachedProjectModelsSetup.java:116)
at com.android.tools.idea.gradle.project.sync.ng.ProjectSetup$ProjectSetupImpl.setUpProject(ProjectSetup.java:82)
at com.android.tools.idea.gradle.project.sync.ng.SyncResultHandler.onSyncSkipped(SyncResultHandler.java:164)
at com.android.tools.idea.gradle.project.sync.ng.NewGradleSync.trySyncWithCachedGradleModels(NewGradleSync.java:219)
at com.android.tools.idea.gradle.project.sync.ng.NewGradleSync.sync(NewGradleSync.java:165)
at com.android.tools.idea.gradle.project.sync.ng.NewGradleSync.access$000(NewGradleSync.java:59)
at com.android.tools.idea.gradle.project.sync.ng.NewGradleSync$2.run(NewGradleSync.java:151)
at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:736)
at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144)
at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:395)
at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:314)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app">
<uses-permission android:name="android.permission.CAMERA"/>
<!-- other permissions go here -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application ...>
...
</application>
if (ContextCompat.checkSelfPermission(YourActivityName.this,
Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(thisActivity,
new String[]{Manifest.permission.CAMERA, Manifest.permission.WRITE_EXTERNAL_STORAGE},
YOUR_PERMISSIONS_REQUEST_CODE);
// YOUR_PERMISSIONS_REQUEST_CODE is an
// app-defined int constant. The callback method gets the
// result of the request.
} else {
// Permission has already been granted
}
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.yourPackageName.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_list"></meta-data>
</provider>