android 自定义textView，实现排版对齐和换行_android textview 多行 左对齐

android开发中的textview可以自动换行,但是对于显示纯英文文字来说很好用，如果夹杂了中文字符后，全角字符和半角字符混在一块儿，就会出现文字排版参差不齐，超级难看，这就需要重写textview来实现我们需要的显示方式。

下面贴上我的代码：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ae="http://www.angellecho.com/"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@android:color/black"
    android:gravity="center_horizontal"
    android:orientation="vertical" >
 
	<ScrollView 
	    android:layout_width="wrap_content"
        android:layout_height="200dp" >
    <com.wigit.MyTextView2
        android:id="@+id/view"
        android:layout_width="fill_parent"
        android:layout_height="200dp"
        android:layout_marginTop="20dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:background="@android:color/darker_gray"
        ae:marginLeft="20"
        ae:marginRight="20"
        ae:paddingLeft="20"
        ae:paddingRight="20"
        ae:textColor="#FFFFFF"
        ae:textSize="30" />
	</ScrollView>
</LinearLayout>

package com.wigit;
 
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
 
public class MyTextView2 extends TextView{
	private final String namespace = "http://www.angellecho.com/";
	private String text;
	private float textSize;
	private float paddingLeft;
	private float paddingRight;
	private float marginLeft;
	private float marginRight;
	private int textColor;
	
	
	private Paint paint1 = new Paint();
	private float textShowWidth;
	public MyTextView2(Context context, AttributeSet attrs) {
		super(context, attrs);
		text = attrs.getAttributeValue(
				"http://schemas.android.com/apk/res/android", "text");
		textSize = attrs.getAttributeIntValue(namespace, "textSize", 15);
		textColor = attrs.getAttributeIntValue(namespace, "textColor",Color.WHITE);
		paddingLeft = attrs.getAttributeIntValue(namespace, "paddingLeft", 0);
		paddingRight = attrs.getAttributeIntValue(namespace, "paddingRight", 0);
		marginLeft = attrs.getAttributeIntValue(namespace, "marginLeft", 0);
		marginRight = attrs.getAttributeIntValue(namespace, "marginRight", 0);
		paint1.setTextSize(textSize);
		paint1.setColor(textColor);
		paint1.setAntiAlias(true);
		textShowWidth = ((Activity) context).getWindowManager().getDefaultDisplay().getWidth() - paddingLeft - paddingRight - marginLeft - marginRight;
	}
	@Override
	protected void onDraw(Canvas canvas) {
		//super.onDraw(canvas);
		int lineCount = 0;
		text = this.getText().toString();//.replaceAll("\n", "\r\n");
		if(text==null)return;
		char[] textCharArray = text.toCharArray();
		// 已绘的宽度
		float drawedWidth = 0;
		float charWidth;
		for (int i = 0; i < textCharArray.length; i++) {
			charWidth = paint1.measureText(textCharArray, i, 1);
			
			if(textCharArray[i]=='\n'){
				lineCount++;
				drawedWidth = 0;
				continue;
			}
			if (textShowWidth - drawedWidth < charWidth) {
				lineCount++;
				drawedWidth = 0;
			}
			canvas.drawText(textCharArray, i, 1, paddingLeft + drawedWidth,
					(lineCount + 1) * textSize, paint1);
			drawedWidth += charWidth;
		}
		setHeight((lineCount + 1) * (int) textSize + 5);
	}
}

package com.text;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
 
import com.wigit.MyTextView2;
 
import android.app.Activity;
import android.content.Context;
import android.content.res.AssetManager;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
 
public class MTextViewActivity extends Activity {
	MyTextView2 view;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);
        
        view = (MyTextView2) findViewById(R.id.view);
        view.setText(getAssetsString(this,"1.txt"));
        view.setMovementMethod(ScrollingMovementMethod.getInstance());
    }

	//读取assets文件夹下文本字符串
	public String getAssetsString(Context context,String fileName){
		StringBuffer sb = new StringBuffer();
		try {
			AssetManager am = context.getAssets();
			InputStream in = am.open(fileName);
			BufferedReader reader = new BufferedReader(new InputStreamReader(in));
			String line;
			while((line = reader.readLine())!=null){
				line += ("\n");
				sb.append(line);
			}
			reader.close();
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return sb.toString();
	}
}