CustomToast.java

CustomToast

import android.content.Context;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

/**
 * 自定义Toast
 */
public class CustomToast {

    private WindowManager mWindowManager;

    private static CustomToast instance;

    private View mView;

    private Handler mHandler;

    private Context mContext;

    private ShowTask mShowTask;

    private CancelTask mCancelTask;


    public CustomToast(Context context) {
        mContext = context.getApplicationContext();
        mHandler = new Handler();
        mShowTask = new ShowTask();
        mCancelTask = new CancelTask();
    }

    public static CustomToast getInstance(Context context) {
        if (instance == null) {
            synchronized (CustomToast.class) {
                if (instance == null) {
                    instance = new CustomToast(context);
                }
            }
        }
        return instance;
    }


    public void cancel() {
        mHandler.post(mCancelTask);
    }

    public void show(String content, int duration) {
        mShowTask.setContent(content);
        mShowTask.setDuration(duration == Toast.LENGTH_SHORT ? 2000 : 3500);
        mHandler.removeCallbacks(mCancelTask);
        mHandler.post(mShowTask);
    }

    private class ShowTask implements Runnable {
        private String content;
        private int duration;

        public void setContent(String cont) {
            content = cont;
        }

        @Override
        public void run() {
            show(content);
            mHandler.postDelayed(mCancelTask, duration);
        }

        private void show(String content) {
            mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
            WindowManager.LayoutParams params = getWindowLayoutParams();
            if (mView == null) {
                initView(content, params);
            } else {
                updateView(content, params);
            }
        }

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

    private void updateView(String content, WindowManager.LayoutParams params) {
        TextView view = (TextView) mView.findViewWithTag("tag_content_view");
        if (view != null) {
            view.setBackgroundColor(Color.TRANSPARENT);
            view.setText(content);
        }
        try {
            mWindowManager.updateViewLayout(mView, params);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void initView(String content, WindowManager.LayoutParams params) {
        Context context = mContext;
        LinearLayout layout = new LinearLayout(context);
        layout.setBackgroundColor(0xff0088dd);
        layout.setOrientation(LinearLayout.HORIZONTAL);
        layout.setGravity(Gravity.CENTER);
        TextView tv = new TextView(context);
        LinearLayout.LayoutParams lpTextView = new LinearLayout.LayoutParams(-1, -2);

        lpTextView.bottomMargin = lpTextView.topMargin = 16;
        lpTextView.rightMargin = lpTextView.leftMargin = 2 * lpTextView.bottomMargin;
        tv.setTag("tag_content_view");
        tv.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
        tv.setTextColor(Color.WHITE);
        tv.setTextSize(TypedValue.COMPLEX_UNIT_PX, 34);
        tv.setText(content);
        layout.addView(tv, lpTextView);
        mView = layout;
        try {
            mWindowManager.addView(mView, params);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @NonNull
    private WindowManager.LayoutParams getWindowLayoutParams() {
        WindowManager.LayoutParams params = new WindowManager.LayoutParams();
        params.format = PixelFormat.RGBA_8888;
        params.gravity = Gravity.CENTER_HORIZONTAL | Gravity.TOP;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS;
        params.height = LayoutParams.WRAP_CONTENT;
        params.width = LayoutParams.WRAP_CONTENT;
        params.y = 730;
        params.type |= WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
        params.windowAnimations = android.R.style.Animation_Toast;
        return params;
    }

    private class CancelTask implements Runnable {
        @Override
        public void run() {
            if (mWindowManager != null && mView != null) {
                try {
                    mWindowManager.removeView(mView);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                mView = null;
                mWindowManager = null;
            }
        }
    }

}