Android自定义TextView仿微信朋友圈文字展开全文功能

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="match_parent"  android:layout_height="match_parent">  <TextView    android:id="@+id/content"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:textSize="16sp"    android:maxLines="3"    android:ellipsize="end"/>  <TextView    android:id="@+id/hide_show"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:background="@drawable/btn_showmore"    android:textColor="@color/colorBlue"    android:textSize="16sp"    android:text="显示更多"    android:padding="0dp"    /></LinearLayout>

//新建java类继承自LinearLayoutpublic class ShowMoreTextView extends LinearLayout {//  用来标记是否为展开状态  private int hideOrShow = 0;  private TextView textView;  private TextView button;  public ShowMoreTextView(Context context) {    super(context);  }  public ShowMoreTextView(Context context, AttributeSet attrs) {    super(context, attrs);//    实例化layoutInflater对象，获取到布局填充服务    LayoutInflater layoutInflater = (LayoutInflater)context.        getSystemService(Context.LAYOUT_INFLATER_SERVICE);//    填充自定义的布局xml文件    layoutInflater.inflate(R.layout.showmore,this);    textView = (TextView)findViewById(R.id.content);    button=(TextView) findViewById(R.id.hide_show);    button.setText("显示更多");//    隐藏或显示    hideOrShow();  }//  创建setContent方法为TextView填充内容  public void setContent(String content) {    textView.setText(content);  }  public void hideOrShow() {    button.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {      //由hideOrShow的值确定按钮和textview的状态        if (hideOrShow == 0) {          button.setText("收起");          textView.setMaxLines(100);          hideOrShow = 2;        }else if(hideOrShow==2){          button.setText("显示更多");          textView.setMaxLines(3);          hideOrShow = 1;        }else if(hideOrShow==1){          button.setText("收起");          textView.setMaxLines(100);          hideOrShow=2;        }      }    });  }}

<?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.commy.activity.TestActivity">  <com.yunfeng.laojiahenan.view.ShowMoreTextView    android:id="@+id/showmore"    android:layout_width="match_parent"    android:layout_height="wrap_content"/></RelativeLayout>

public class TestActivity extends AppCompatActivity {  private ShowMoreTextView showMoreTextView;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_test);    showMoreTextView=(ShowMoreTextView)findViewById(R.id.showmore);    showMoreTextView.setContent("      There is so much life      I've left to live      And this fire's burning still      When I watch you look at me       I think I could find a way      To stand for every dream      And forsake this solid ground      And give up this fear within      Of what would happen if they end you      I'm in love with you    ");  }}