Android常用UI组件 - TextView

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本文深入探讨了Android中TextView组件的使用方法，通过实例展示了如何在应用中显示文本信息。主要内容包括TextView的基本属性设置、代码实现及运行效果解析。

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TextView是Android里面用的最多的UI组件，一般使用在需要显示一些信息的时候，其不能输入，只能初始设定或者在程序中修改。

实例：TextViewDemo

运行效果：

代码清单：

布局文件：main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="这里是TextView，你可以在这里显示一些文本信息。"
    />
</LinearLayout>

Java源代码文件：MainActivity.java

package com.rainsong.textviewdemo;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

API知识点

Activity

public class

Activity

extends ContextThemeWrapper

implements ComponentCallbacks2 KeyEvent.Callback LayoutInflater.Factory2 View.OnCreateContextMenuListener Window.Callback

Known Direct Subclasses

AccountAuthenticatorActivity, ActivityGroup, AliasActivity, ExpandableListActivity, FragmentActivity, ListActivity, NativeActivity

Known Indirect Subclasses

LauncherActivity, PreferenceActivity, TabActivity

void setContentView(int layoutResID)

Set the activity content from a layout resource.

TextView

public class

TextView

extends View

implements ViewTreeObserver.OnPreDrawListener

Known Direct Subclasses

Button, CheckedTextView, Chronometer, DigitalClock, EditText, TextClock

Known Indirect Subclasses

AutoCompleteTextView, CheckBox, CompoundButton, ExtractEditText, MultiAutoCompleteTextView, RadioButton, Switch, ToggleButton

Class Overview

Displays text to the user and optionally allows them to edit it. A TextView is a complete text editor, however the basic class is configured
 to not allow editing; see EditText for a subclass that configures the text view for editing.

Public Constructors

TextView(Context context)

TextView(Context context, AttributeSet attrs)

TextView(Context context, AttributeSet attrs, int defStyle)