Android:Toast消息的兩種用法
知識點:
- Toast消息機制
- LayoutInflater 、inflate()動態加載佈局文件
- 開發規範
Android Studio
MainActivity.java代碼片
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package com.android.geoquiz;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private Button mTrueButton;
private Button mFalseButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTrueButton =(Button) findViewById(R.id.true_button);
mFalseButton = (Button) findViewById(R.id.false_button);
mTrueButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast mToast = Toast.makeText(MainActivity.this, R.string.right_toast, Toast.LENGTH_SHORT);
mToast.setGravity(Gravity.CENTER|Gravity.LEFT,0,0);
mToast.show();
}
});
mFalseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
LayoutInflater mInFlater =getLayoutInflater(); ///調用Activity的getLayoutInflater()
//inflate()動態載入一個res目錄下的xml界面;find.View.By.Id()加載xml文件下的widget控件
View mLayout = mInFlater.inflate(R.layout.activity_toast,(ViewGroup)findViewById(R.id.custom_toast_container));
//找到指定位置(即mLayout)的text文本框,並修改其中的content
TextView mText =(TextView) mLayout.findViewById(R.id.text);
mText.setText("This is custom toast");
//Toast消息框機制
Toast toast = new Toast(getApplicationContext());
toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(mLayout);
toast.show();
}
});
}
}
activity_main.xml代碼片
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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question_content"
android:padding="20dp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<Button
android:id="@+id/true_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/true_button"
/>
<Button
android:id="@+id/false_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/false_button"
/>
</LinearLayout>
</LinearLayout>
activity_toast.xml代碼片
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/custom_toast_container"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="8dp"
android:background="#DAAA"
>
<ImageView android:src="@drawable/ic_launcher_foreground"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="8dp"
/>
<TextView android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF"
/>
</LinearLayout>
修改strings.xml 代碼片
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<resources>
<string name="app_name">GeoQuiz</string>
<string name="question_content">canberra is the captital od Australia</string>
<string name="true_button">TRUE</string>
<string name="false_button">FALSE</string>
<string name="right_toast">correct</string>
<string name="wrong_toast">incorrect</string>
</resources>
鏈接
谷歌官方文檔:
[1]: https://developer.android.google.cn/guide/topics/ui/notifiers/toasts