TextView在Android O提供了充分的理由(新的排版对齐)本身。 你只需要这样做:

科特林

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    textView.justificationMode = JUSTIFICATION_MODE_INTER_WORD
}

Java

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    textView.setJustificationMode(JUSTIFICATION_MODE_INTER_WORD);
}

XML

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:justificationMode="inter_word" />

默认值是jusication_mode_none (xml中的none)。

我不认为Android支持完全的理由。

更新2018-01-01:Android 8.0+支持TextView对齐模式。

虽然仍然不是完整的文本，你现在可以平衡行长度使用android:breakStrategy="balanced"从API 23起

http://developer.android.com/reference/android/widget/TextView.html#attr_android:breakStrategy

Android目前还不支持完全的理由。我们可以使用Webview和证明HTML而不是使用textview。它工作得很好。如果你们不清楚，可以问我:)

我写了自己的类来解决这个问题，这里 你只需要调用带有两个参数的static justify函数

文本视图对象 内容宽度(文本视图的总宽度)

/ / MainActivity

package com.fawad.textjustification;
import android.app.Activity;
import android.database.Cursor;
import android.graphics.Point;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.Gravity;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
    static Point size;
    static float density;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Display display = getWindowManager().getDefaultDisplay();
        size=new Point();
        DisplayMetrics dm=new DisplayMetrics();
        display.getMetrics(dm);
        density=dm.density;
        display.getSize(size);


        TextView tv=(TextView)findViewById(R.id.textView1);
        Typeface typeface=Typeface.createFromAsset(this.getAssets(), "Roboto-Medium.ttf");
        tv.setTypeface(typeface);
        tv.setLineSpacing(0f, 1.2f);
        tv.setTextSize(10*MainActivity.density);

        //some random long text
         String myText=getResources().getString(R.string.my_text);

         tv.setText(myText);
        TextJustification.justify(tv,size.x);


    }

    @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;
    }

}

文本对齐类

package com.fawad.textjustification;

import java.util.ArrayList;

import android.graphics.Paint;
import android.text.TextUtils;
import android.widget.TextView;

public class TextJustification {

    public static void justify(TextView textView,float contentWidth) {
        String text=textView.getText().toString();
        Paint paint=textView.getPaint();

        ArrayList<String> lineList=lineBreak(text,paint,contentWidth);

        textView.setText(TextUtils.join(" ", lineList).replaceFirst("\\s", ""));
    }


    private static ArrayList<String> lineBreak(String text,Paint paint,float contentWidth){
        String [] wordArray=text.split("\\s"); 
        ArrayList<String> lineList = new ArrayList<String>();
        String myText="";

        for(String word:wordArray){
            if(paint.measureText(myText+" "+word)<=contentWidth)
                myText=myText+" "+word;
            else{
                int totalSpacesToInsert=(int)((contentWidth-paint.measureText(myText))/paint.measureText(" "));
                lineList.add(justifyLine(myText,totalSpacesToInsert));
                myText=word;
            }
        }
        lineList.add(myText);
        return lineList;
    }

    private static String justifyLine(String text,int totalSpacesToInsert){
        String[] wordArray=text.split("\\s");
        String toAppend=" ";

        while((totalSpacesToInsert)>=(wordArray.length-1)){
            toAppend=toAppend+" ";
            totalSpacesToInsert=totalSpacesToInsert-(wordArray.length-1);
        }
        int i=0;
        String justifiedText="";
        for(String word:wordArray){
            if(i<totalSpacesToInsert)
                justifiedText=justifiedText+word+" "+toAppend;

            else                
                justifiedText=justifiedText+word+toAppend;

            i++;
        }

        return justifiedText;
    }

}

/ / 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"

    tools:context=".MainActivity" 
    >



    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"

             >
            <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
        </LinearLayout>
    </ScrollView>

</RelativeLayout>

XML布局:声明WebView而不是TextView

<WebView
 android:id="@+id/textContent"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content" />

Java代码:设置文本数据到WebView

WebView view = (WebView) findViewById(R.id.textContent);
String text;
text = "<html><body><p align=\"justify\">";
text+= "This is the text will be justified when displayed!!!";
text+= "</p></body></html>";
view.loadData(text, "text/html", "utf-8");

这也许能解决你的问题。 它完全为我工作。