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：