Android Studio 3 教程之2-Button Toast

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activity_main.xml

<?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:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_toast"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:textColor="@android:color/white"
        android:text="@string/button_label_toast"
        android:onClick="showToast"/>

    <TextView
        android:id="@+id/show_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="@dimen/count_text_size"
        android:textStyle="bold"
        android:gravity="center"
        android:background="@color/myBackgroundColor"
        android:textColor="@color/colorPrimary"
        android:layout_weight="1"
        android:text="@string/count_initial_value" />

    <Button
        android:id="@+id/button_count"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        android:textColor="@android:color/white"
        android:text="@string/button_label_count"
        android:onClick="countUp"/>
</LinearLayout>

dimens.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="count_text_size">160sp</dimen>
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
</resources>

colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
    <color name="myBackgroundColor">#FFF043</color>
</resources>

MainActivity.java

package com.example.s.buttontoast;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private int count=0;
    private TextView tv_show_count;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_show_count = findViewById(R.id.show_count);
    }

    public void showToast(View view) {
        Toast.makeText(this, R.string.toast_message, Toast.LENGTH_SHORT).show();
    }

    public void countUp(View view) {
        count++;
        if(tv_show_count!=null){
            tv_show_count.setText(Integer.toString(count));
        }
    }
}

activity_main.xml for ButtonRelative

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_toast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:background="@color/colorPrimary"
        android:onClick="showToast"
        android:text="@string/button_label_toast"
        android:textColor="@android:color/white" />

    <Button
        android:id="@+id/button_count"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:background="@color/colorPrimary"
        android:onClick="countUp"
        android:text="@string/button_label_count"
        android:textColor="@android:color/white"
        android:layout_below="@+id/button_toast"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:id="@+id/show_count"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:background="@color/myBackgroundColor"
        android:gravity="center"
        android:text="@string/count_initial_value"
        android:textColor="@color/colorPrimary"
        android:textSize="@dimen/count_text_size"
        android:textStyle="bold"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/button_toast"
        android:layout_toEndOf="@+id/button_toast" />
</RelativeLayout>

activity_main.xml for ButtonContrain

In the Component Tree window, right-click LinearLayout and then choose Convert layout to ConstraintLayout from the context menu.
Right-click (or Control-click) ConstraintLayout in the Component Tree pane, and choose Clear All Constraints.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:orientation="vertical"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:id="@+id/relativeLayout">

    <Button
        android:id="@+id/button_toast"
        android:layout_width="107dp"
        android:layout_height="47dp"
        android:layout_marginStart="24dp"
        android:layout_marginLeft="24dp"
        android:layout_marginTop="8dp"
        android:layout_gravity="center_horizontal"
        android:background="@color/colorPrimary"
        android:onClick="showToast"
        android:text="@string/button_label_toast"
        android:textColor="@android:color/white"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button_count"
        android:layout_width="142dp"
        android:layout_height="50dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_gravity="center_horizontal"
        android:background="@color/colorPrimary"
        android:onClick="countUp"
        android:text="@string/button_label_count"
        android:textColor="@android:color/white"
        app:layout_constraintBaseline_toBaselineOf="@+id/show_count"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/show_count"
        android:layout_width="94dp"
        android:layout_height="229dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_gravity="center_horizontal"
        android:background="@color/myBackgroundColor"
        android:gravity="center"
        android:text="@string/count_initial_value"
        android:textColor="@color/colorPrimary"
        android:textSize="@dimen/count_text_size"
        android:textStyle="bold"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toRightOf="@id/button_count"/>
</android.support.constraint.ConstraintLayout>

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Android Studio 3 -Button Toast

activity_main.xml

dimens.xml

colors.xml

MainActivity.java

activity_main.xml for ButtonRelative

activity_main.xml for ButtonContrain

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