Question

对于那些早些时候帮助过这个项目的人，非常感谢！我的代码不再有任何问题，我做了额外的调整。既然应用程序现在非常强大，我还想再做一件事。

在此处查看layout的屏幕截图。

通常，吐司视图显示在屏幕的底部中央。一旦调用OnClick，我想让它出现在（8dp）提交按钮下方。我怎样才能做到这一点。

package com.lookjohn.guessnumber;

import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
Random random; 
Button button;
EditText text;

int input; 
int MIN, MAX;
int comp; 
int guesses;

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    random = new Random();
    button = (Button)findViewById(R.id.button1);
    text = (EditText)findViewById(R.id.editText1);

    MIN = 1;
    MAX = 100;
    comp = random.nextInt(MAX - MIN + 1) + MIN; // Generate random number between 1 and 100.
    guesses = 0;

    button.setOnClickListener(myhandler1);
}

View.OnClickListener myhandler1 = new View.OnClickListener() {

    public void onClick(View v) {

        // Implemented max number of guesses, detect 
        // number of guesses and return from the method.

        String value = text.getText().toString(); // Get value from input from editTextView

        // If user submits an empty EditText, return to prevent a crash.
        if (value.isEmpty()) {
            Toast.makeText(MainActivity.this, "You must enter a guess!", Toast.LENGTH_SHORT);
            return;
        }

        input = Integer.parseInt(value); // Turn string into integer
        guesses++;
        if (input > 100) {
            Toast.makeText(MainActivity.this, 
                "That number is greater than 100. Not Valid!", 
                Toast.LENGTH_SHORT).show();
                return;
            }

        else if (input < comp)
            Toast.makeText(MainActivity.this, 
                "Your number is too small.", 
                Toast.LENGTH_SHORT).show();
        else if (input > comp) 
            Toast.makeText(MainActivity.this, 
                "Your number is too big.", 
                Toast.LENGTH_SHORT).show();
        else
            Toast.makeText(MainActivity.this, 
                "Good job! The answer was " + comp + ".\n" +
                "You made " + guesses + " guesses.\n" +
                "Restart the app to try again.", 
                Toast.LENGTH_LONG).show();
    }
};

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

Answer 1

android.widget.Toast 定义了一系列有用的方法，可以自定义Toast通知的外观。您应该研究的方法是setGravity(int, int, int)。如果下面有0个偏移代码，则将吐司顶部固定在所提供视图的底部，并将吐司中心固定到视图的中心。

public static void positionToast(Toast toast, View view, Window window, int offsetX, int offsetY) {
    // toasts are positioned relatively to decor view, views relatively to their parents, we have to gather additional data to have a common coordinate system
    Rect rect = new Rect();
    window.getDecorView().getWindowVisibleDisplayFrame(rect);
    // covert anchor view absolute position to a position which is relative to decor view
    int[] viewLocation = new int[2];
    view.getLocationInWindow(viewLocation);
    int viewLeft = viewLocation[0] - rect.left;
    int viewTop = viewLocation[1] - rect.top;

    // measure toast to center it relatively to the anchor view
    DisplayMetrics metrics = new DisplayMetrics();
    window.getWindowManager().getDefaultDisplay().getMetrics(metrics);
    int widthMeasureSpec = MeasureSpec.makeMeasureSpec(metrics.widthPixels, MeasureSpec.UNSPECIFIED);
    int heightMeasureSpec = MeasureSpec.makeMeasureSpec(metrics.heightPixels, MeasureSpec.UNSPECIFIED);
    toast.getView().measure(widthMeasureSpec, heightMeasureSpec);
    int toastWidth = toast.getView().getMeasuredWidth();

    // compute toast offsets
    int toastX = viewLeft + (view.getWidth() - toastWidth) / 2 + offsetX;
    int toastY = viewTop + view.getHeight() + offsetY;

    toast.setGravity(Gravity.LEFT | Gravity.TOP, toastX, toastY);
}

使用它将需要在 onClick 方法中修改与toast相关的行：

int offsetY = getResources().getDimensionPixelSize(R.dimen.toast_offset_y);

Toast toast = Toast.makeText(MainActivity.this, "That number is greater than 100. Not Valid!", Toast.LENGTH_SHORT);
positionToast(toast, v, getWindow(), 0, offsetY);
toast.show();

Answer 2

关于你的问题，关于如何在特定位置展示祝酒词，你可以这样做： -

Toast toast = new Toast();
toast.setGravity(Gravity.TOP|Gravity.LEFT, 0, 0);
toast.makeText(getApplicationContextt(),"Text",Toast.LENGTH_SHORT);
toast.show();

您可以在此代码中进行修改，以更改吐司位置： -

    toast.setGravity(Gravity.TOP|Gravity.LEFT, 0, 0);

Answer 3

我只想添加codebase回答。

in positionToast：

    ...
    int toastHeight= toast.getView().getMeasuredHeight();

    // compute toast offsets
    ...
    int toastY = viewTop + (view.getHeight() - toastHeight) / 2 + offsetY;

onClick中的

：

    positionToast(toast, view, getWindow(), 0, 0);

无论视图放在何处，这似乎都在我的视野中完美地集中了Toast。我的代码中假设Toast总是小于它所在的视图。

Answer 4

从开发者指南中，您可以使用toast.setGravity（）来定位Toast。我在http://developer.android.com/guide/topics/ui/notifiers/toasts.html

上找到了这个

定位你的Toast标准的Toast通知出现在附近   屏幕底部，水平居中。你可以改变这个   使用setGravity（int，int，int）方法的位置。这接受三个   参数：重力常数，x位置偏移和y位置   偏移量。

例如，如果你决定吐司应该出现在   左上角，您可以像这样设置重力：

toast.setGravity（Gravity.TOP | Gravity.LEFT，0,0）;如果你想轻推   向右的位置，增加第二个参数的值。   要轻推它，请增加最后一个参数的值。

我认为您可以获得按钮的位置并将其转发给上述方法

Answer 5

据我所知，这是我为该计划提出的最好的。这样做会将Toast消息放在手机的中央。

if(input > 100) {   
            Toast toast = Toast.makeText(MainActivity.this, 
                R.string.over_guess, 
                Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.CENTER, 0, 0); 
            toast.show();   
            return;
            }
        else if(input < comp) {
            Toast toast = Toast.makeText(MainActivity.this, 
                getString(R.string.guess_low, input), 
                Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.CENTER, 0, 0); 
            toast.show();
        }
        else if(input > comp) {
            Toast toast = Toast.makeText(MainActivity.this, 
                getString(R.string.guess_high, input), 
                Toast.LENGTH_SHORT);
            toast.setGravity(Gravity.CENTER, 0, 0); 
            toast.show();
        }
        else {
            Toast toast = Toast.makeText(MainActivity.this, 
                getString(R.string.correct, comp, guesses), 
                Toast.LENGTH_LONG);
            toast.setGravity(Gravity.CENTER, 0, 0); 
            toast.show();
        }

Answer 6

没有任何答案对我有用，我将上述答案组合在一起，我得到了解决方案。

enter image description here

第二个计时器是目标视图。

 public static void displayToastUnderView(Activity activity, View view, String text) {
        Toast toast = Toast.makeText(activity, text, Toast.LENGTH_SHORT);
        toast.setGravity( Gravity.TOP, view.getLeft() - view.getWidth() / 2 - toast.getView().getWidth() / 2, view.getBottom());
        toast.show();
    }

在视图下方显示Toast小部件

6 个答案: