原文:
Android项目实战（五）：TextView自适应大小
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"
1 <me.grantland.widget.AutofitTextView
2 android:id="@+id/output_autofit"
3 android:layout_width="match_parent"
4 android:layout_height="wrap_content"
5 android:text="@string/example"
6 android:textSize="50sp"
7 android:gravity="center"
8 android:singleLine="true"
9 autofit:minTextSize="8sp"
10 />
布局文件：
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1 <?xml version="1.0" encoding="utf-8"?>
2 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
3 xmlns:autofit="http://schemas.android.com/apk/res-auto"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent">
6 <LinearLayout
7 android:layout_width="match_parent"
8 android:layout_height="wrap_content"
9 android:orientation="vertical"
10 >
11 <EditText
12 android:id="@+id/input"
13 android:layout_width="match_parent"
14 android:layout_height="wrap_content"
15 android:singleLine="true"
16 android:hint="@string/input_hint"
17 android:text="@string/example"/>
18 <TextView
19 android:layout_width="match_parent"
20 android:layout_height="wrap_content"
21 android:text="@string/label_normal"
22 />
23 <TextView
24 android:id="@+id/output"
25 android:layout_width="match_parent"
26 android:layout_height="wrap_content"
27 android:text="@string/example"
28 android:textSize="50sp"
29 android:gravity="center"
30 />
31 <TextView
32 android:layout_width="match_parent"
33 android:layout_height="wrap_content"
34 android:text="@string/label_autofit"
35 />
36 <me.grantland.widget.AutofitTextView
37 android:id="@+id/output_autofit"
38 android:layout_width="match_parent"
39 android:layout_height="wrap_content"
40 android:text="@string/example"
41 android:textSize="50sp"
42 android:gravity="center"
43 android:singleLine="true"
44 autofit:minTextSize="8sp"
45 />
46 </LinearLayout>
47 </ScrollView>
activity_main.xml
string.xml
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1 <?xml version="1.0" encoding="utf-8"?>
2 <resources>
3
4 <string name="app_name">Texttest</string>
5 <string name="action_settings">Settings</string>
6 <string name="hello_world">Hello world!</string>
7
8 <string name="input_hint">text</string>
9 <string name="label_normal">Normal:</string>
10 <string name="label_autofit">Autofit:</string>
11
12 <string name="example">This is an example</string>
13
14 </resources>
View Code
activity
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1 package com.example.texttest;
2
3 import android.app.Activity;
4 import android.os.Bundle;
5 import android.text.Editable;
6 import android.text.TextWatcher;
7 import android.view.Menu;
8 import android.widget.EditText;
9 import android.widget.TextView;
10
11 public class MainActivity extends Activity {
12
13 private TextView mOutput;
14 private TextView mAutofitOutput;
15 @Override
16 protected void onCreate(Bundle savedInstanceState) {
17 super.onCreate(savedInstanceState);
18 setContentView(R.layout.activity_main);
19 mOutput = (TextView)findViewById(R.id.output);
20 mAutofitOutput = (TextView)findViewById(R.id.output_autofit);
21
22 ((EditText)findViewById(R.id.input)).addTextChangedListener(new TextWatcher() {
23 @Override
24 public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {
25 // do nothing
26 }
27
28 @Override
29 public void onTextChanged(CharSequence charSequence, int i, int i2, int i3) {
30 mOutput.setText(charSequence);
31 mAutofitOutput.setText(charSequence);
32 }
33
34 @Override
35 public void afterTextChanged(Editable editable) {
36 // do nothing
37 }
38 });
39 }
40
41
42
43 @Override
44 public boolean onCreateOptionsMenu(Menu menu) {
45 // Inflate the menu; this adds items to the action bar if it is present.
46 getMenuInflater().inflate(R.menu.main, menu);
47 return true;
48 }
49
50 }
MainActivity.java
效果：
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