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更新 我添加了以下代码：

        v1.setDrawingCacheEnabled(true);
    v1.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), 
            MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
    v1.layout(0, 0, v1.getMeasuredWidth(), v1.getMeasuredHeight()); 
    v1.buildDrawingCache(true);

现在我得到了截图，但它们不是我需要的。例如，我需要捕获的一个屏幕由一个包含 ImageView 和 ListView 的 LinearLayout 组成。在应用程序执行期间加载 Activity 时，列表显示 10 个项目。我得到的捕获只显示了顶部的图像视图和大约 1.5 个列表项。我能做些什么来准确捕捉屏幕显示的内容吗？（我会发布我得到的照片，但由于 IP 问题，我基本上必须编辑所有内容，并且发布一个填充的黑色矩形并不是超级有用）

/更新

我的目标是 Android 2.2，并尝试开发一个可以从任何活动中调用的类，以捕获当前屏幕并将图像存储在 SD 卡上（最好是 PNG）。我发现了类似的问题，但这里有一个重要区别：我无法创建新视图，也无法将此代码构建到每个 Activity 中（我可以在每个 Activity 中添加一个函数调用）。
所以我需要 1）获取当前 Activity 的视图（我正在使用 ((ViewGroup)findViewById(android.R.id.content)).getChildAt(0)) 和 2）将该视图传递给另一个函数类（定义如下）。我已经尝试将这个和这个结合起来，但是在 .getDrawingCache() 调用之后我得到的位图是空的，所以 .compress 炸弹。

这是代码：

public static void captureScreen(View v1){
                View v1= v;
        v1.setDrawingCacheEnabled(true);
        Bitmap bm = v1.getDrawingCache();
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        try {
            bm.compress(Bitmap.CompressFormat.PNG, 100, bytes);
        } catch (Exception e1) {
            Log.e("BM.Compress", e1.getMessage());
        }

        //create a new file name "test.jpg" in sdcard folder.
        File f = new File(Environment.getExternalStorageDirectory()
                                + File.separator + context.getPackageName().replace(".", File.separator) 
                                + File.separator + "screenshots" + File.separator +  "test.jpg");
        //Log.d("CF", context.getPackageName());
        try {
            f.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //write the bytes in file
        try {
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
}

日志猫：

06-06 16:37:14.613: D/AndroidRuntime(284): Shutting down VM
06-06 16:37:14.613: W/dalvikvm(284): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
06-06 16:37:14.768: E/AndroidRuntime(284): FATAL EXCEPTION: main
06-06 16:37:14.768: E/AndroidRuntime(284): java.lang.RuntimeException: Unable to start activity ComponentInfo{pkgname.pkgnameExpo/pkgname.pkgnameExpo.SplashActivity}: java.lang.NullPointerException: println needs a message
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.os.Looper.loop(Looper.java:123)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.ActivityThread.main(ActivityThread.java:4627)
06-06 16:37:14.768: E/AndroidRuntime(284):  at java.lang.reflect.Method.invokeNative(Native Method)
06-06 16:37:14.768: E/AndroidRuntime(284):  at java.lang.reflect.Method.invoke(Method.java:521)
06-06 16:37:14.768: E/AndroidRuntime(284):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-06 16:37:14.768: E/AndroidRuntime(284):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-06 16:37:14.768: E/AndroidRuntime(284):  at dalvik.system.NativeStart.main(Native Method)
06-06 16:37:14.768: E/AndroidRuntime(284): Caused by: java.lang.NullPointerException: println needs a message
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.util.Log.println_native(Native Method)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.util.Log.e(Log.java:215)
06-06 16:37:14.768: E/AndroidRuntime(284):  at pkgname.pkgnameExpo.Classes.CFunctions.captureScreen(CFunctions.java:432)
06-06 16:37:14.768: E/AndroidRuntime(284):  at pkgname.pkgnameExpo.SplashActivity.onCreate(SplashActivity.java:38)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-06 16:37:14.768: E/AndroidRuntime(284):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-06 16:37:14.768: E/AndroidRuntime(284):  ... 11 more

我只能从调试中得知，在调用 bm.compress 之前，bm 为空，而 v1 则不是。有任何想法吗？

更新 这是新的 LogCat，我认为它告诉我它无法创建文件？ 

06-06 22:13:55.975: I/System.out(12244): debugger has settled (1400)
06-06 22:13:58.351: E/BM.Compress(12244): nullfixnull
06-06 22:13:58.411: W/System.err(12244): java.io.IOException: No such file or directory
06-06 22:13:58.421: W/System.err(12244):    at java.io.File.createNewFileImpl(Native Method)
06-06 22:13:58.432: W/System.err(12244):    at java.io.File.createNewFile(File.java:1160)
06-06 22:13:58.432: W/System.err(12244):    at pkgname.pkgnameExpo.Classes.CFunctions.captureScreen(CFunctions.java:441)
06-06 22:13:58.441: W/System.err(12244):    at pkgname.pkgnameExpo.SplashActivity.onCreate(SplashActivity.java:38)
06-06 22:13:58.451: W/System.err(12244):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-06 22:13:58.451: W/System.err(12244):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-06 22:13:58.461: W/System.err(12244):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-06 22:13:58.461: W/System.err(12244):    at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-06 22:13:58.471: W/System.err(12244):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-06 22:13:58.471: W/System.err(12244):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 22:13:58.491: W/System.err(12244):    at android.os.Looper.loop(Looper.java:123)
06-06 22:13:58.491: W/System.err(12244):    at android.app.ActivityThread.main(ActivityThread.java:4627)
06-06 22:13:58.501: W/System.err(12244):    at java.lang.reflect.Method.invokeNative(Native Method)
06-06 22:13:58.511: W/System.err(12244):    at java.lang.reflect.Method.invoke(Method.java:521)
06-06 22:13:58.511: W/System.err(12244):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-06 22:13:58.522: W/System.err(12244):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-06 22:13:58.522: W/System.err(12244):    at dalvik.system.NativeStart.main(Native Method)
06-06 22:13:58.531: W/System.err(12244): java.io.FileNotFoundException: /mnt/sdcard/pkgname/pkgnameExpo/screenshots/test.jpg (No such file or directory)
06-06 22:13:58.541: W/System.err(12244):    at org.apache.harmony.luni.platform.OSFileSystem.openImpl(Native Method)
06-06 22:13:58.551: W/System.err(12244):    at org.apache.harmony.luni.platform.OSFileSystem.open(OSFileSystem.java:152)
06-06 22:13:58.551: W/System.err(12244):    at java.io.FileOutputStream.<init>(FileOutputStream.java:97)
06-06 22:13:58.561: W/System.err(12244):    at java.io.FileOutputStream.<init>(FileOutputStream.java:69)
06-06 22:13:58.561: W/System.err(12244):    at pkgname.pkgnameExpo.Classes.CFunctions.captureScreen(CFunctions.java:447)
06-06 22:13:58.571: W/System.err(12244):    at pkgname.pkgnameExpo.SplashActivity.onCreate(SplashActivity.java:38)
06-06 22:13:58.571: W/System.err(12244):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
06-06 22:13:58.581: W/System.err(12244):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-06 22:13:58.581: W/System.err(12244):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-06 22:13:58.591: W/System.err(12244):    at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-06 22:13:58.591: W/System.err(12244):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-06 22:13:58.601: W/System.err(12244):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 22:13:58.601: W/System.err(12244):    at android.os.Looper.loop(Looper.java:123)
06-06 22:13:58.612: W/System.err(12244):    at android.app.ActivityThread.main(ActivityThread.java:4627)
06-06 22:13:58.612: W/System.err(12244):    at java.lang.reflect.Method.invokeNative(Native Method)
06-06 22:13:58.621: W/System.err(12244):    at java.lang.reflect.Method.invoke(Method.java:521)
06-06 22:13:58.631: W/System.err(12244):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
06-06 22:13:58.631: W/System.err(12244):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
06-06 22:13:58.641: W/System.err(12244):    at dalvik.system.NativeStart.main(Native Method)
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1 回答 1

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您似乎正在为您的文件构建一个相当深的路径名。如果所有这些目录都不存在，您需要在一个文件对象上调用 mkdirs()，该文件对象代表您要写入文件的目录。

于 2012-06-06T22:31:58.373 回答