android字符串显示的宽度

方法一：

activity_main.xml

<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:background="#FFCCCCCC" >    <TextView        android:id="@+id/am_text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"         android:background="@android:color/background_dark"        android:textColor="@android:color/background_light"        android:layout_centerInParent="true"/></RelativeLayout>

MainActivity.java

package com.example.testexample;import android.app.Activity;import android.graphics.Paint;import android.os.Bundle;import android.widget.TextView;public class MainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                TextView tv = (TextView)findViewById(R.id.am_text);                                Paint paint = tv.getPaint();         float textWidth = paint.measureText("sample text");        tv.setWidth((int)textWidth);         tv.setText("sample text");        }}

 方法二:

activity_main.xml与方法一一样

MainActivity.java

package com.example.testexample;import android.app.Activity;import android.graphics.Paint;import android.os.Bundle;import android.widget.TextView;public class MainActivity extends Activity {    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                TextView tv = (TextView)findViewById(R.id.am_text);                //此处paint与方法一不一样        Paint paint = new Paint();        float textSize = tv.getTextSize();        paint.setTextSize(textSize);         final float textWidth = paint.measureText("sample text");          tv.setWidth((int)textWidth);           tv.setText("sample text");                      }}