Android之TextView自适应大小

2019-12-12 03:30:55

字体：大中小

来源：转载

供稿：网友

对于设置TextView的字体默认大小对于UI界面的好看程度是很重要的，小屏幕设置的文字过大或者大屏幕设置的文字过小都造成UI的不美观

现在就让我们学习自适应大小的TextView控件，即当文字长度变化时，文字的大小会相应的变化，保证显示在一行当中

实现依靠于第三方类库

第三方类来源：

https://github.com/grantland/android-autofittextview

和正常的使用TextView一样，只需要将要自适应的TextView标签设置为<me.grantland.widget.AutofitTextView/>

注意：一定要设置为单行，否定无法显示效果

android:singleLine="true"

<me.grantland.widget.AutofitTextView   android:id="@+id/output_autofit"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:text="@string/example"   android:textSize="50sp"   android:gravity="center"   android:singleLine="true"   autofit:minTextSize="8sp"   />

布局文件：

<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:autofit="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:orientation="vertical"  >  <EditText   android:id="@+id/input"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:singleLine="true"   android:hint="@string/input_hint"   android:text="@string/example"/>  <TextView   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:text="@string/label_normal"   />  <TextView   android:id="@+id/output"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:text="@string/example"   android:textSize="50sp"   android:gravity="center"   />  <TextView   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:text="@string/label_autofit"   />  <me.grantland.widget.AutofitTextView   android:id="@+id/output_autofit"   android:layout_width="match_parent"   android:layout_height="wrap_content"   android:text="@string/example"   android:textSize="50sp"   android:gravity="center"   android:singleLine="true"   autofit:minTextSize="8sp"   /> </LinearLayout></ScrollView>activity_main.xml

string.xml

<?xml version="1.0" encoding="utf-8"?><resources> <string name="app_name">Texttest</string> <string name="action_settings">Settings</string> <string name="hello_world">Hello world!</string> <string name="input_hint">text</string> <string name="label_normal">Normal:</string> <string name="label_autofit">Autofit:</string> <string name="example">This is an example</string></resources>

activity

package com.example.texttest;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.text.TextWatcher;import android.view.Menu;import android.widget.EditText;import android.widget.TextView;public class MainActivity extends Activity { private TextView mOutput; private TextView mAutofitOutput; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  mOutput = (TextView)findViewById(R.id.output);  mAutofitOutput = (TextView)findViewById(R.id.output_autofit);  ((EditText)findViewById(R.id.input)).addTextChangedListener(new TextWatcher() {   @Override   public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {    // do nothing   }   @Override   public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {    mOutput.setText(charSequence);    mAutofitOutput.setText(charSequence);   }   @Override   public void afterTextChanged(Editable editable) {    // do nothing   }  }); } @Override public boolean onCreateOptionsMenu(Menu menu) {  // Inflate the menu; this adds items to the action bar if it is present.  getMenuInflater().inflate(R.menu.main, menu);  return true; }}MainActivity.java

效果：