Android自定义Toast

转于：http://blog.csdn.net/zhangweiwtmdbf/article/details/30031015

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一、引言

在开发的过程中你会发现Android自身的Toast提示有许多限制，比如我想自定义Toast的动画、自定义一个美观的View显示在Toast中、更多的是让Toast显示指定的时长等等。

首先一下效果如何：

 

二、原理

自定义的原理也很简单，就是给WindowManager添加View和删除View，不过需要设置WindowManager.LayoutParams和View的样式，使其看起来和Android系统的Toast看起来很相像。

具体代码如下：

 

/**
 * Custom Toast
 *
 * @author Lucky
 *
 */
public class ToastHelper {
    public static final int LENGTH_LONG = 3500;
    public static final int LENGTH_SHORT = 2000;
    private WindowManager mWindowManager;
    private WindowManager.LayoutParams mWindowParams;
    private View toastView;
    private Context mContext;
    private Handler mHandler;
    private String mToastContent = "";
    private int duration = 0;
    private int animStyleId = android.R.style.Animation_Toast;

    private final Runnable timerRunnable = new Runnable() {

        @Override
        public void run() {
            removeView();
        }
    };

    private ToastHelper(Context context) {
        // Notice: we should get application context
        // otherwise we will get error
        // "Activity has leaked window that was originally added"
        Context ctx = context.getApplicationContext();
        if (ctx == null) {
            ctx = context;
        }
        this.mContext = ctx;
        mWindowManager = (WindowManager) mContext
                .getSystemService(Context.WINDOW_SERVICE);
        init();
    }

    private void init() {
        mWindowParams = new WindowManager.LayoutParams();
        mWindowParams.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        mWindowParams.alpha = 1.0f;
        mWindowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        mWindowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
        mWindowParams.gravity = Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
        mWindowParams.format = PixelFormat.TRANSLUCENT;
        mWindowParams.type = WindowManager.LayoutParams.TYPE_TOAST;
        mWindowParams.setTitle("ToastHelper");
        mWindowParams.packageName = mContext.getPackageName();
        mWindowParams.windowAnimations = animStyleId;// TODO
        mWindowParams.y = mContext.getResources().getDisplayMetrics().widthPixels / 5;
    }

    @SuppressWarnings("deprecation")
    @SuppressLint("NewApi")
    private View getDefaultToastView() {

        TextView view = new TextView(mContext);
        view.setText(mToastContent);
        view.setGravity(Gravity.CENTER_VERTICAL | Gravity.START);
        view.setFocusable(false);
        view.setClickable(false);
        view.setFocusableInTouchMode(false);
        view.setTextColor(android.graphics.Color.WHITE);
        Drawable drawable = mContext.getResources().getDrawable(
                android.R.drawable.toast_frame);

        if (Build.VERSION.SDK_INT < 16) {
            view.setBackgroundDrawable(drawable);
        } else {
            view.setBackground(drawable);
        }
        return view;
    }

    public void show() {
        removeView();
        if (toastView == null) {
            toastView = getDefaultToastView();
        }
        mWindowParams.gravity = android.support.v4.view.GravityCompat
                .getAbsoluteGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM,
                        android.support.v4.view.ViewCompat
                                .getLayoutDirection(toastView));
        removeView();
        mWindowManager.addView(toastView, mWindowParams);
        if (mHandler == null) {
            mHandler = new Handler();
        }
        mHandler.postDelayed(timerRunnable, duration);
    }

    public void removeView() {
        if (toastView != null && toastView.getParent() != null) {
            mWindowManager.removeView(toastView);
            mHandler.removeCallbacks(timerRunnable);
        }
    }

    /**
     * @param context
     * @param content
     * @param duration
     * @return
     */
    public static ToastHelper makeText(Context context, String content,
            int duration) {
        ToastHelper helper = new ToastHelper(context);
        helper.setDuration(duration);
        helper.setContent(content);
        return helper;
    }

    /**
     * @param context
     * @param strId
     * @param duration
     * @return
     */
    public static ToastHelper makeText(Context context, int strId, int duration) {
        ToastHelper helper = new ToastHelper(context);
        helper.setDuration(duration);
        helper.setContent(context.getString(strId));
        return helper;
    }

    public ToastHelper setContent(String content) {
        this.mToastContent = content;
        return this;
    }

    public ToastHelper setDuration(int duration) {
        this.duration = duration;
        return this;
    }

    public ToastHelper setAnimation(int animStyleId) {
        this.animStyleId = animStyleId;
        mWindowParams.windowAnimations = this.animStyleId;
        return this;
    }

    /**
     * custom view
     *
     * @param view
     */
    public ToastHelper setView(View view) {
        this.toastView = view;
        return this;
    }
}

另外分享一个自定义的Anim:

 

1.显示Toast的动画：

 

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:fillAfter="true" >

    <alpha
        android:fromAlpha="0.0"
        android:toAlpha="1.0" />

    <translate
        android:fromYDelta="20%"
        android:toYDelta="0%" />

    <scale
        android:fromXScale="0.5"
        android:fromYScale="0.5"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1.0"
        android:toYScale="1.0" />

</set>

2.退出Toast的动画：

 

 

<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
    android:fillAfter="true" >

    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.0" />

    <translate
        android:fromYDelta="0%"
        android:toYDelta="20%" />

</set>

 

给WIndowManager中的View添加动画需要定义一个style，如下：

 

<style name="PopToast">
    <item name="@android:windowEnterAnimation">@anim/anim_toast_enter</item>
    <item name="@android:windowExitAnimation">@anim/anim_toast_exit</item>
</style>

最后可以按照如下的方式去使用：

 

 

ToastHelper
                    .makeText(this, "hello world 你好，哈拉雷速度发说得对",
                            ToastHelper.LENGTH_SHORT)
                    .setAnimation(R.style.PopToast).show();

 

三、参考资料：

SuperToast: https://github.com/JohnPersano/SuperToasts