18.9.13-TextView

创建TextView

1.创建一个新的Active(置于与MainActive同一目录下)
2.在MainActivity中创建Button，通过Button跳转到TextViewActivity

MainActive

public class MainActivity extends Activity {

    private Button mBtnTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mBtnTextView = (Button) findViewById(R.id.btn_textview);
        mBtnTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //跳转到演示界面
                Intent intent = new Intent(MainActivity.this, TextViewActivity.class);
                startActivity(intent);
            }
        });
    }
}

3.在TextViewActive下查找代码，并访问"activity_text_view.xml"文件

      setContentView(R.layout.activity_text_view);

4.在xml文件下即可编辑界面

activity_text_view.xml示例如下

<?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp"
    android:background="#669999">

    <TextView
        android:id="@+id/tv_1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/tv_test1"
        android:textColor="#000000"
        android:textSize="36sp" />

    <TextView
        android:id="@+id/tv_2"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:maxLines="1"
        android:ellipsize="end"
        android:text="helloworld"
        android:textColor="#000000"
        android:textSize="36sp"
        android:layout_marginTop="15dp"/>

    <TextView
        android:id="@+id/tv_3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="筛选"
        android:drawableRight="@drawable/arrowdown"
        android:drawablePadding="10dp"
        android:textColor="#000000"
        android:textSize="36sp"
        android:layout_marginTop="15dp"/>

    <TextView
        android:id="@+id/tv_4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:text="中划线"
        android:textColor="#000000"
        android:textSize="36sp" />

    <TextView
      android:id="@+id/tv_5"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
       android:layout_marginTop="15dp"
       android:text="下划线"
       android:textColor="#000000"
       android:textSize="36sp" />

   <TextView
       android:id="@+id/tv_6"
       android:layout_width="200dp"
       android:layout_height="wrap_content"
       android:layout_marginTop="15dp"

       android:textColor="#000000"
       android:textSize="36sp"
       android:ellipsize="marquee"
       android:marqueeRepeatLimit="marquee_forever"
       android:text="AndroidAndroidAndroidAndroid"/>

</LinearLayout>

5. 为实现中划线，下划线，跑马灯效果，在TextViewActive中更新代码

TextViewActive

package com.test.semir.firstapp;

import android.app.Activity;
import android.graphics.Paint;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class TextViewActivity extends Activity {
    private TextView mTv4,mTv5,mTv6;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_text_view);

        mTv4 = findViewById(R.id.tv_4);
        mTv4.getPaint().setFlags(Paint.STRIKE_THRU_TEXT_FLAG);  //中划线
        mTv4.getPaint().setAntiAlias(true);  //消除锯齿

        mTv5 = findViewById(R.id.tv_5);
        mTv5.getPaint().setFlags(Paint.UNDERLINE_TEXT_FLAG);  //下划线
        mTv5.getPaint().setAntiAlias(true);

        mTv6 = findViewById(R.id.tv_6);
        mTv6.setSingleLine(true);//设置单行显示
        mTv6.setHorizontallyScrolling(true);//横向滚动
        mTv6.setMarqueeRepeatLimit(-1);
        mTv6.setSelected(true);//开始滚

    }
}

android2.PNG