我出乎意料地收到了一个我一直在尝试解决但却不成功的nullpoint异常错误。我已经在下面包含了logcat。
09-28 20:12:29.543: E/AndroidRuntime(3588): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
09-28 20:26:37.291: E/AndroidRuntime(3778): FATAL EXCEPTION: main
09-28 20:26:37.291: E/AndroidRuntime(3778): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.dooba.beta/com.dooba.beta.MoodActivity}: java.lang.NullPointerException
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.os.Handler.dispatchMessage(Handler.java:99)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.os.Looper.loop(Looper.java:137)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-28 20:26:37.291: E/AndroidRuntime(3778): at java.lang.reflect.Method.invokeNative(Native Method)
09-28 20:26:37.291: E/AndroidRuntime(3778): at java.lang.reflect.Method.invoke(Method.java:525)
09-28 20:26:37.291: E/AndroidRuntime(3778): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-28 20:26:37.291: E/AndroidRuntime(3778): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-28 20:26:37.291: E/AndroidRuntime(3778): at dalvik.system.NativeStart.main(Native Method)
09-28 20:26:37.291: E/AndroidRuntime(3778): Caused by: java.lang.NullPointerException
09-28 20:26:37.291: E/AndroidRuntime(3778): at com.dooba.beta.MoodActivity.onCreate(MoodActivity.java:60)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.Activity.performCreate(Activity.java:5133)
09-28 20:26:37.291: E/AndroidRuntime(3778): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
09-28 20:26:37.291: E/AndroidRuntime(3778): ... 11 more
以下是活动代码：
public class MoodActivity extends Activity {
private FeedbackDialog feedBack;
private LocationManager mlocManager;
private LocationListener mlocListener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mood);
ImageView ishowsshadow = (ImageView) this.findViewById(R.id.ishows);
ishowsshadow.setImageBitmap(highlightImage(BitmapFactory.decodeResource(getResources(), R.drawable.band5)));
ParseAnalytics.trackAppOpened(getIntent());
// inform the Parse Cloud that it is ready for notifications
PushService.setDefaultPushCallback(this, matchOptionActivity.class, R.drawable.ic_dooba);
ParseInstallation.getCurrentInstallation().saveInBackground();
PushService.subscribe(this, "Updates", LoginActivity.class, R.drawable.ic_dooba);
feedBack = new FeedbackDialog(this, "AF-46D8F2A319EA-0A");
mlocManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
if(mlocManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
{
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1800000, 0, mlocListener);
}
else
{
Context context = getApplicationContext();
AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
builder1.setMessage("Your network provider is disabled. We need access to your location as it will help us provide you with the best recommendations. " +
"We determine your location based on availability of cell tower and WiFi access points. Hence, please configure your network.");
builder1.setCancelable(true);
builder1.setPositiveButton("View Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
startActivity(new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS));
}
});
AlertDialog alert11 = builder1.create();
alert11.setCancelable(false);
alert11.show();
}
public Bitmap highlightImage(Bitmap src) {
// create new bitmap, which will be painted and becomes result image
Bitmap bmOut = Bitmap.createBitmap(src.getWidth() + 96, src.getHeight() + 96, Bitmap.Config.ARGB_8888);
// setup canvas for painting
Canvas canvas = new Canvas(bmOut);
// setup default color
canvas.drawColor(0, PorterDuff.Mode.CLEAR);
// create a blur paint for capturing alpha
Paint ptBlur = new Paint();
ptBlur.setMaskFilter(new BlurMaskFilter(15, Blur.NORMAL));
int[] offsetXY = new int[2];
// capture alpha into a bitmap
Bitmap bmAlpha = src.extractAlpha(ptBlur, offsetXY);
// create a color paint
Paint ptAlphaColor = new Paint();
ptAlphaColor.setColor(0xFFFFFFFF);
// paint color for captured alpha region (bitmap)
canvas.drawBitmap(bmAlpha, offsetXY[0], offsetXY[1], ptAlphaColor);
// free memory
bmAlpha.recycle();
// paint the image source
canvas.drawBitmap(src, 0, 0, null);
// return out final image
return bmOut;
}
第60行，我认为错误位于onCreate：
下ishowsshadow.setImageBitmap(highlightImage(BitmapFactory.decodeResource(getResources(), R.drawable.band5)));
是引用imageview的布局部分
<ImageView
android:id="@+id/ishows"
android:layout_width="160dp"
android:layout_height="55dp"
android:layout_alignLeft="@+id/icasual"
android:layout_below="@+id/textView2"
android:layout_marginTop="60dp"
android:contentDescription="@string/experience_eating"
android:src="@drawable/band5"
/>
答案 0 :(得分：0)
尝试在源解码中添加选项并修改
getResources() 中的 context.getResources()
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
image = BitmapFactory.decodeResource(context.getResources(), R.id.myimage, options);