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我對Android非常陌生。我正嘗試使用具有圖像疊加層的相機。我已經看到很多討論這個話題的線索，但他們仍然有點頭大。這裏是我的活動：我使用相機的代碼有什麼問題？
package com.commonsware.android.skeleton;
import android.app.Activity;
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.widget.FrameLayout;
import java.io.IOException;
import java.util.List;
// ----------------------------------------------------------------------
public class SimpleBulbActivity extends Activity {
private Preview mPreview;
FrameLayout preview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Hide the window title.
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
}
protected void onResume() {
//Setup the FrameLayout with the Camera Preview Screen
mPreview = new Preview(this);
preview = (FrameLayout)findViewById(R.id.preview);
preview.addView(mPreview);
}
}
// ----------------------------------------------------------------------
class Preview extends SurfaceView implements SurfaceHolder.Callback {
SurfaceHolder mHolder;
Camera mCamera;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
mCamera = Camera.open();
try {
mCamera.setPreviewDisplay(holder);
} catch (IOException exception) {
mCamera.release();
mCamera = null;
// TODO: add more exception handling logic here
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.05;
double targetRatio = (double) w/h;
if (sizes == null) return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes) {
double ratio = (double) size.width/size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = mCamera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size optimalSize = getOptimalPreviewSize(sizes, w, h);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);
mCamera.setParameters(parameters);
mCamera.startPreview();
}
}
正如你所看到的，我使用預覽類的可以在文檔中發現的CameraPreview例子。這是我的佈局：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/layout">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="Camera Demo"
android:textSize="24sp" />
<FrameLayout android:id="@+id/preview"
android:layout_weight="1" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</FrameLayout>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/buttonClick"
android:text="Click" android:layout_gravity="center"></Button>
</LinearLayout>
所以我正在做的是創建表面，然後試圖將其添加到預覽FrameLayout內的佈局。雖然它不工作。它馬上崩潰。幫助將會很棒！
這裏是我的清單：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.commonsware.android.skeleton"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".SimpleBulbActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
</manifest>
道歉，這裏是整個logcat的。我在那裏看到兩個例外，所以也許這是造成它的原因？
12-20 16:16:10.843: ERROR/BatteryService(68): usbOnlinePath not found
12-20 16:16:10.843: ERROR/BatteryService(68): batteryVoltagePath not found
12-20 16:16:10.843: ERROR/BatteryService(68): batteryTemperaturePath not found
12-20 16:16:10.883: ERROR/SurfaceFlinger(68): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake
12-20 16:16:11.003: ERROR/SensorService(68): couldn't open device for module sensors (Invalid argument)
12-20 16:16:15.923: ERROR/System(68): Failure starting core service
12-20 16:16:15.923: ERROR/System(68): java.lang.SecurityException
12-20 16:16:15.923: ERROR/System(68): at android.os.BinderProxy.transact(Native Method)
12-20 16:16:15.923: ERROR/System(68): at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146)
12-20 16:16:15.923: ERROR/System(68): at android.os.ServiceManager.addService(ServiceManager.java:72)
12-20 16:16:15.923: ERROR/System(68): at com.android.server.ServerThread.run(SystemServer.java:206)
12-20 16:16:15.953: ERROR/EventHub(68): could not get driver version for /dev/input/mouse0, Not a typewriter
12-20 16:16:15.953: ERROR/EventHub(68): could not get driver version for /dev/input/mice, Not a typewriter
12-20 16:16:16.564: ERROR/SoundPool(68): error loading /system/media/audio/ui/Effect_Tick.ogg
12-20 16:16:16.564: ERROR/SoundPool(68): error loading /system/media/audio/ui/KeypressStandard.ogg
12-20 16:16:16.564: ERROR/SoundPool(68): error loading /system/media/audio/ui/KeypressSpacebar.ogg
12-20 16:16:16.564: ERROR/SoundPool(68): error loading /system/media/audio/ui/KeypressDelete.ogg
12-20 16:16:16.564: ERROR/SoundPool(68): error loading /system/media/audio/ui/KeypressReturn.ogg
12-20 16:16:16.623: ERROR/UsbObserver(68): java.lang.NullPointerException
12-20 16:16:16.623: ERROR/UsbObserver(68): at com.android.server.UsbObserver.init(UsbObserver.java:131)
12-20 16:16:16.623: ERROR/UsbObserver(68): at com.android.server.UsbObserver.<init>(UsbObserver.java:65)
12-20 16:16:16.623: ERROR/UsbObserver(68): at com.android.server.ServerThread.run(SystemServer.java:402)
12-20 16:16:17.233: ERROR/ThrottleService(68): Could not open GPS configuration file /etc/gps.conf
12-20 16:16:20.224: ERROR/logwrapper(160): executing /system/bin/tc failed: No such file or directory
12-20 16:16:20.324: ERROR/logwrapper(162): executing /system/bin/tc failed: No such file or directory
12-20 16:16:20.394: ERROR/logwrapper(163): executing /system/bin/tc failed: No such file or directory
12-20 16:16:58.542: ERROR/AndroidRuntime(326): FATAL EXCEPTION: main
12-20 16:16:58.542: ERROR/AndroidRuntime(326): java.lang.RuntimeException: Unable to resume activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity}: android.app.SuperNotCalledException: Activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity} did not call through to super.onResume()
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2095)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2110)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1643)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.os.Handler.dispatchMessage(Handler.java:99)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.os.Looper.loop(Looper.java:123)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread.main(ActivityThread.java:3647)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at java.lang.reflect.Method.invokeNative(Native Method)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at java.lang.reflect.Method.invoke(Method.java:507)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at dalvik.system.NativeStart.main(Native Method)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): Caused by: android.app.SuperNotCalledException: Activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity} did not call through to super.onResume()
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.Activity.performResume(Activity.java:3835)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2085)
12-20 16:16:58.542: ERROR/AndroidRuntime(326): ... 12 more
12-20 16:17:19.592: ERROR/AndroidRuntime(355): FATAL EXCEPTION: main
12-20 16:17:19.592: ERROR/AndroidRuntime(355): java.lang.RuntimeException: Unable to resume activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity}: android.app.SuperNotCalledException: Activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity} did not call through to super.onResume()
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2095)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2110)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1643)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.os.Handler.dispatchMessage(Handler.java:99)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.os.Looper.loop(Looper.java:123)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread.main(ActivityThread.java:3647)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at java.lang.reflect.Method.invokeNative(Native Method)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at java.lang.reflect.Method.invoke(Method.java:507)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at dalvik.system.NativeStart.main(Native Method)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): Caused by: android.app.SuperNotCalledException: Activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity} did not call through to super.onResume()
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.Activity.performResume(Activity.java:3835)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2085)
12-20 16:17:19.592: ERROR/AndroidRuntime(355): ... 12 more
12-20 16:18:11.932: ERROR/AndroidRuntime(365): FATAL EXCEPTION: main
12-20 16:18:11.932: ERROR/AndroidRuntime(365): java.lang.RuntimeException: Unable to resume activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity}: android.app.SuperNotCalledException: Activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity} did not call through to super.onResume()
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2095)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2110)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1643)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.os.Handler.dispatchMessage(Handler.java:99)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.os.Looper.loop(Looper.java:123)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread.main(ActivityThread.java:3647)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at java.lang.reflect.Method.invokeNative(Native Method)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at java.lang.reflect.Method.invoke(Method.java:507)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at dalvik.system.NativeStart.main(Native Method)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): Caused by: android.app.SuperNotCalledException: Activity {com.commonsware.android.skeleton/com.commonsware.android.skeleton.SimpleBulbActivity} did not call through to super.onResume()
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.Activity.performResume(Activity.java:3835)
12-20 16:18:11.932: ERROR/AndroidRuntime(365): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2085)
請提供logcat的 – bart
堆棧跟蹤沒有看到你的清單或logcat的，我只能猜測。但有一件事我可以預料會導致幾乎立即崩潰是一個SecurityException。您必須在清單中擁有「android.permission.CAMERA」權限：http://developer.android.com/reference/android/Manifest.permission.html#CAMERA – Jakar
我不確定在logcat中查找什麼，但這裏有兩條似乎相關的線。 '12-20 15：24：15.282：WARN/ActivityManager（61）：啓動超時已過，放棄喚醒鎖！ 12-20 15：24：16.619：WARN/ActivityManager（61）：HistoryRecord的活動空閒超時{406bf3e0 com.commonsware.android.skeleton/.SimpleBulbActivity} ' –