开发android的同学可能会抱怨Toast设定显示的时长无效，只能是Toast.LENGTH_LONG 或者Toast.LENGTH_SHORT 之一，为了解决这些办法，有多种实现方式：

1.使用定时器，定时调用show()方法.

2.使用CountDownTimer类，也是调用show()方法.

3.使用WindownManager类实现.

本文使用方法三进行实现，难度不大，直接看代码吧.

package com.open.toast;

import android.content.Context;

import android.graphics.Color;

import android.graphics.PixelFormat;

import android.os.Handler;

import android.view.Gravity;

import android.view.View;

import android.view.WindowManager;

import android.widget.LinearLayout;

import android.widget.TextView;

/**

* 自定义时长的Toast

* @author DexYang

*

*/

public class CToast {

public static CToast makeText(Context context, CharSequence text, int duration)

{

CToast result = new CToast(context);

LinearLayout mLayout=new LinearLayout(context);

TextView tv = new TextView(context);

tv.setText(text);

tv.setTextColor(Color.WHITE);

tv.setGravity(Gravity.CENTER);

mLayout.setBackgroundResource(R.drawable.widget_toast_bg);

int w=context.getResources().getDisplayMetrics().widthPixels / 2;

int h=context.getResources().getDisplayMetrics().widthPixels / 10;

mLayout.addView(tv, w, h);

result.mNextView = mLayout;

result.mDuration = duration;

return result;

}

public static final int LENGTH_SHORT = 2000;

public static final int LENGTH_LONG = 3500;

private final Handler mHandler = new Handler();

private int mDuration=LENGTH_SHORT;

private int mGravity = Gravity.CENTER;

private int mX, mY;

private float mHorizontalMargin;

private float mVerticalMargin;

private View mView;

private View mNextView;

private WindowManager mWM;

private final WindowManager.LayoutParams mParams = new WindowManager.LayoutParams();

public CToast(Context context) {

init(context);

}

/**

* Set the view to show.

* @see #getView

*/

public void setView(View view) {

mNextView = view;

}

/**

* Return the view.

* @see #setView

*/

public View getView() {

return mNextView;

}

/**

* Set how long to show the view for.

* @see #LENGTH_SHORT

* @see #LENGTH_LONG

*/

public void setDuration(int duration) {

mDuration = duration;

}

/**

* Return the duration.

* @see #setDuration

*/

public int getDuration() {

return mDuration;

}

/**

* Set the margins of the view.

*

* @param horizontalMargin The horizontal margin, in percentage of the

* container width, between the container's edges and the

* notification

* @param verticalMargin The vertical margin, in percentage of the

* container height, between the container's edges and the

* notification

*/

public void setMargin(float horizontalMargin, float verticalMargin) {

mHorizontalMargin = horizontalMargin;

mVerticalMargin = verticalMargin;

}

/**

* Return the horizontal margin.

*/

public float getHorizontalMargin() {

return mHorizontalMargin;

}

/**

* Return the vertical margin.

*/

public float getVerticalMargin() {

return mVerticalMargin;

}

/**

* Set the location at which the notification should appear on the screen.

* @see android.view.Gravity

* @see #getGravity

*/

public void setGravity(int gravity, int xOffset, int yOffset) {

mGravity = gravity;

mX = xOffset;

mY = yOffset;

}

/**

* Get the location at which the notification should appear on the screen.

* @see android.view.Gravity

* @see #getGravity

*/

public int getGravity() {

return mGravity;

}

/**

* Return the X offset in pixels to apply to the gravity's location.

*/

public int getXOffset() {

return mX;

}

/**

* Return the Y offset in pixels to apply to the gravity's location.

*/

public int getYOffset() {

return mY;

}

/**

* schedule handleShow into the right thread

*/

public void show() {

mHandler.post(mShow);

if(mDuration>0)

{

mHandler.postDelayed(mHide, mDuration);

}

}

/**

* schedule handleHide into the right thread

*/

public void hide() {

mHandler.post(mHide);

}

private final Runnable mShow = new Runnable() {

public void run() {

handleShow();

}

};

private final Runnable mHide = new Runnable() {

public void run() {

handleHide();

}

};

private void init(Context context)

{

final WindowManager.LayoutParams params = mParams;

params.height = WindowManager.LayoutParams.WRAP_CONTENT;

params.width = WindowManager.LayoutParams.WRAP_CONTENT;

params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE

| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE

| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;

params.format = PixelFormat.TRANSLUCENT;

params.windowAnimations = android.R.style.Animation_Toast;

params.type = WindowManager.LayoutParams.TYPE_TOAST;

params.setTitle("Toast");

mWM = (WindowManager) context.getApplicationContext()

.getSystemService(Context.WINDOW_SERVICE);

}

private void handleShow() {

if (mView != mNextView) {

// remove the old view if necessary

handleHide();

mView = mNextView;

// mWM = WindowManagerImpl.getDefault();

final int gravity = mGravity;

mParams.gravity = gravity;

if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.FILL_HORIZONTAL)

{

mParams.horizontalWeight = 1.0f;

}

if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.FILL_VERTICAL)

{

mParams.verticalWeight = 1.0f;

}

mParams.x = mX;

mParams.y = mY;

mParams.verticalMargin = mVerticalMargin;

mParams.horizontalMargin = mHorizontalMargin;

if (mView.getParent() != null)

{

mWM.removeView(mView);

}

mWM.addView(mView, mParams);

}

}

private void handleHide()

{

if (mView != null)

{

if (mView.getParent() != null)

{

mWM.removeView(mView);

}

mView = null;

}

}

}

测试类的代码如下：

package com.open.toast;

import android.app.Activity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.EditText;

public class MainActivity extends Activity {

private EditText mEditText;

private CToast mCToast;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

init();

}

private void init()

{

mEditText=(EditText)findViewById(R.id.timeEditText);

findViewById(R.id.showToastBtn).setOnClickListener(listener);

findViewById(R.id.hideToastBtn).setOnClickListener(listener);

}

private View.OnClickListener listener=new View.OnClickListener() {

@Override

public void onClick(View v) {

switch(v.getId())

{

case R.id.showToastBtn:

if(null!=mCToast)

{

mCToast.hide();

}

int time=TextUtils.isEmpty(mEditText.getText().toString())?CToast.LENGTH_SHORT:Integer.valueOf(mEditText.getText().toString());

mCToast=CToast.makeText(getApplicationContext(), "我来自CToast!",time);

mCToast.show();

break;

case R.id.hideToastBtn:

if(null!=mCToast)

{

mCToast.hide();

}

break;

}

}

};

}

效果如下：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。