如何展现Activity Indicator

问：

How can i show an Activity Indicator in Android? Is there any Android Library given method? If no, please let me know the techniques used to show activity indicator in Android?.

回答1：

ProgressDialog mDialog = new ProgressDialog(getApplicationContext());            mDialog.setMessage("Please wait...");            mDialog.setCancelable(false);            mDialog.show();

回答2：

There is two another ways of showing activity indicator not using modal ProgressDialog.

You can use ImageView in your layout and apply animation to it (http://developer.android.com/reference/android/view/animation/RotateAnimation.html)

public void startAnimation() {  // Create an animation  RotateAnimation rotation = new RotateAnimation(      0f,      360f,      Animation.RELATIVE_TO_SELF,      0.5f,      Animation.RELATIVE_TO_SELF,      0.5f);  rotation.setDuration(1200);  rotation.setInterpolator(new LinearInterpolator());  rotation.setRepeatMode(Animation.RESTART);  rotation.setRepeatCount(Animation.INFINITE);  // and apply it to your imageview  findViewById(R.id.myActivityIndicator).startAnimation(rotation);}

Or you can use xml-drawable to describe a background image, which will have some rotating animation:

Firstly describe a drawable (in i.e. /res/drawable/my-indicator.xml)

 xmlns:android="http://schemas.android.com/apk/res/android"    android:drawable="@drawable/spinner_black_76"    android:pivotX="50%"    android:pivotY="50%"    android:framesCount="12"    android:frameDuration="100" />

Then set it at some view's background

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