[Android] 開發第十一天

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MainActivity.java 代碼如下：

package com.oazzz.test9;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    // 事件監聽器的幾種實現方式    // 1. 內部類形式    // 2. 外部類形式    // 3. Activity 本身作為事件監聽器類    // 4. 匿名內部類形式    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TextView c1 = (TextView) findViewById(R.id.c1);        c1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Toast.makeText(view.getContext(), "點擊了第一行文本！", Toast.LENGTH_LONG).show();            }        });        TextView c2 = (TextView) findViewById(R.id.c2);        c2.setOnClickListener(new ButtonClickListener());        TextView c3 = (TextView) findViewById(R.id.c3);        c3.setOnClickListener(this);    }    @Override    public void onClick(View view) {        Toast.makeText(view.getContext(), "點擊了第三行文本！", Toast.LENGTH_LONG).show();    }    public void clickHandler(View view){        Toast.makeText(view.getContext(), "點擊了第四行文本！", Toast.LENGTH_SHORT).show();    }    private final class ButtonClickListener implements View.OnClickListener{        @Override        public void onClick(View view) {            Toast.makeText(view.getContext(), "點擊了第二行文本！", Toast.LENGTH_SHORT).show();        }    }}

activity_main.xml 代碼如下：

<?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"    tools:context="com.oazzz.test9.MainActivity">    <TextView        android:id="@+id/c1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/c1"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent"        app:layout_constraintVertical_bias="0.2" />    <TextView        android:id="@+id/c2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/c2"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent"        app:layout_constraintVertical_bias="0.4" />    <TextView        android:id="@+id/c3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/c3"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent"        app:layout_constraintVertical_bias="0.6" />    <TextView        android:id="@+id/c4"        android:onClick="clickHandler"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/c4"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent"        app:layout_constraintVertical_bias="0.8" /></android.support.constraint.ConstraintLayout>

Android-Studio 中 自動產生重載代碼的功能表項目在 Generate -> Override Methods...

[Android] 開發第十一天