简单的示例代码:
首先,使用Android Stuidio创建一个空项目。
创建基本的UI界面,activity_main.xml:
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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.topspeedsnail.clock.MainActivity"> <TextClock android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textClock" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="143dp" /> <AnalogClock android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/analogClock" android:layout_marginTop="82dp" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:visibility="invisible" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="切换" android:id="@+id/button" android:layout_below="@+id/analogClock" android:layout_centerHorizontal="true" /> </RelativeLayout> |
MainActivity.java 中的代码:
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package com.topspeedsnail.clock; import android.speech.tts.TextToSpeech; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.AnalogClock; import android.widget.Button; import android.widget.TextClock; import android.view.View; public class MainActivity extends AppCompatActivity { static private Button swap; static private TextClock textClock; static private AnalogClock analogClock; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); swap = (Button) findViewById(R.id.button); textClock = (TextClock) findViewById(R.id.textClock); analogClock = (AnalogClock) findViewById(R.id.analogClock); swap.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (textClock.getVisibility() == TextClock.VISIBLE ) { textClock.setVisibility(TextClock.INVISIBLE); analogClock.setVisibility(AnalogClock.VISIBLE); } else { textClock.setVisibility(TextClock.VISIBLE); analogClock.setVisibility(AnalogClock.INVISIBLE); } } }); } } |
运行:
点击切换按钮: