Android自定义吐司Toast：自定义样式、自定义显示时长
鉴于系统toast，一般都是黑色背景且位于界面底部，我们看到有些app弹出的toast，有的在界面中间、有的在界面顶部，还有的是带图片的，那是怎么实现的呢？
了解系统toast类有哪些方法
- setView( )：设置toast视图，也就是通过layout布局来控制toast显示不同的视图。
- setGravity( )：设置toast显示位置。
- setDuration( )：设置toast显示的时长，注意：此方法设置自定义时长不起作用，需用其他方法实现。
自定义Toast类ToastUtil：包括自定义样式、自定义显示时长
package com.nicksong.toastutil.util;import android.content.Context;import android.os.CountDownTimer;import android.os.Handler;import android.util.Log;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.widget.TextView;import android.widget.Toast;import com.nicksong.toastutil.R;/** * 作者：nicksong * 创建时间：2016/11/21 * 功能描述:自定义toast样式、显示时长 */public class ToastUtil { private Toast mToast; private TextView mTextView; private TimeCount timeCount; private String message; private Handler mHandler = new Handler(); private boolean canceled = true; public ToastUtil(Context context, int layoutId, String msg) { message = msg; LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //自定义布局 View view = inflater.inflate(layoutId, null); //自定义toast文本 mTextView = (TextView)view.findViewById(R.id.toast_msg); mTextView.setText(msg); Log.i("ToastUtil", "Toast start..."); if (mToast == null) { mToast = new Toast(context); Log.i("ToastUtil", "Toast create..."); } //设置toast居中显示 mToast.setGravity(Gravity.CENTER, 0, 0); mToast.setDuration(Toast.LENGTH_LONG); mToast.setView(view); } /** * 自定义居中显示toast */ public void show() { mToast.show(); Log.i("ToastUtil", "Toast show..."); } /** * 自定义时长、居中显示toast * @param duration */ public void show(int duration) { timeCount = new TimeCount(duration, 1000); Log.i("ToastUtil", "Toast show..."); if (canceled) { timeCount.start(); canceled = false; showUntilCancel(); } } /** * 隐藏toast */ private void hide() { if (mToast != null) { mToast.cancel(); } canceled = true; Log.i("ToastUtil", "Toast that customed duration hide..."); } private void showUntilCancel() { if (canceled) { //如果已经取消显示，就直接return return; } mToast.show(); mHandler.postDelayed(new Runnable() { @Override public void run() { Log.i("ToastUtil", "Toast showUntilCancel..."); showUntilCancel(); } }, Toast.LENGTH_LONG); } /** * 自定义计时器 */ private class TimeCount extends CountDownTimer { public TimeCount(long millisInFuture, long countDownInterval) { super(millisInFuture, countDownInterval); //millisInFuture总计时长，countDownInterval时间间隔(一般为1000ms) } @Override public void onTick(long millisUntilFinished) { mTextView.setText(message + ": " + millisUntilFinished / 1000 + "s后消失"); } @Override public void onFinish() { hide(); } }} ##具体使用方法
package com.nicksong.toastutil;import android.content.Context;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.widget.Button;import android.widget.Toast;import com.nicksong.toastutil.util.ToastUtil;public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private Context context = MainActivity.this; private Button btDefaultToast; private Button btCenterToast; private Button btTopToast; private Button btCenterImgToast1; private Button btCenterImgToast2; private Button btCustomDurationToast; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); initListener(); } private void initView() { btDefaultToast = (Button)findViewById(R.id.bt_default_toast); btCenterToast = (Button)findViewById(R.id.bt_center_toast); btTopToast = (Button)findViewById(R.id.bt_top_toast); btCenterImgToast1 = (Button)findViewById(R.id.bt_center_img_toast1); btCenterImgToast2 = (Button)findViewById(R.id.bt_center_img_toast2); btCustomDurationToast = (Button)findViewById(R.id.bt_custom_duration_toast); } private void initListener() { btDefaultToast.setOnClickListener(this); btCenterToast.setOnClickListener(this); btTopToast.setOnClickListener(this); btCenterImgToast1.setOnClickListener(this); btCenterImgToast2.setOnClickListener(this); btCustomDurationToast.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_default_toast: Toast.makeText(context, "默认toast", Toast.LENGTH_SHORT).show(); break; case R.id.bt_center_toast: Toast toast = Toast.makeText(context, "自定义居中toast", Toast.LENGTH_SHORT); toast.setGravity(Gravity.CENTER, 0, 0); toast.show(); break; case R.id.bt_top_toast: Toast toast1 = Toast.makeText(context, "自定义顶部toast", Toast.LENGTH_SHORT); toast1.setGravity(Gravity.TOP, 0, 0); toast1.show(); break; case R.id.bt_center_img_toast1: ToastUtil toastUtil = new ToastUtil(context, R.layout.toast_center, "完全自定义居中toast 1"); toastUtil.show(); break; case R.id.bt_center_img_toast2: ToastUtil toastUtil2 = new ToastUtil(context, R.layout.toast_center_horizontal, "完全自定义居中toast 2"); toastUtil2.show(); break; case R.id.bt_custom_duration_toast: ToastUtil toastUtil3 = new ToastUtil(context, R.layout.toast_center_horizontal, "带图片自定义时长toast"); toastUtil3.show(5000); break; default: break; } }} ##自定义样式和时长的Toast效果图 
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