使用的Android Studioclass：com.example.myprogressbar;
android.support.v7.app.AppCompatActivity;
android.os.Bundle;
android.view.Window;
MainActivity AppCompatActivity {
onCreate(Bundle savedInstanceState) {
.onCreate(savedInstanceState);
requestWindowFeature(Window.);
requestWindowFeature(Window.);
setContentView(R.layout.);
}
}logcat：01-29 20:22:43.004 1190-1190/? E/AndroidRuntime: FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myprogressbar/com.example.myprogressbar.MainActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) at android.app.ActivityThread.access$600(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method) Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:226) at android.app.Activity.requestWindowFeature(Activity.java:3264) at com.example.myprogressbar.MainActivity.onCreate(MainActivity.java:12) at android.app.Activity.performCreate(Activity.java:5133) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) at android.app.ActivityThread.access$600(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method)
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