Android实现TextView文字水平滚动效果实现

第一步：编写MarqueeText.java类，继承自TextView

import android.annotation.SuppressLint;  
import android.content.Context;  
import android.graphics.Canvas;  
import android.os.Handler;  
import android.os.Message;  
import android.util.AttributeSet;  
import android.widget.TextView;  
  
  
public class MarqueeText extends TextView {  
     /** 是否停止滚动 */  
    private boolean mStopMarquee;  
    private String mText;  
    private float mCoordinateX;  
    private float mTextWidth;  
  
  
    public MarqueeText(Context context, AttributeSet attrs) {  
        super(context, attrs);  
    }  
  
  
    public void setText(String text) {  
        this.mText = text;  
        mTextWidth = getPaint().measureText(mText);  
        if (mHandler.hasMessages(0))  
            mHandler.removeMessages(0);  
        mHandler.sendEmptyMessageDelayed(0, 2000);  
    }  
  
  
    @SuppressLint("NewApi")  
    @Override  
    protected void onAttachedToWindow() {  
        mStopMarquee = false;  
        if (!(mText == null || mText.isEmpty()))  
            mHandler.sendEmptyMessageDelayed(0, 2000);  
        super.onAttachedToWindow();  
    }  
  
  
    @Override  
    protected void onDetachedFromWindow() {  
        mStopMarquee = true;  
        if (mHandler.hasMessages(0))  
            mHandler.removeMessages(0);  
        super.onDetachedFromWindow();  
    }  
  
  
    @SuppressLint("NewApi")  
    @Override  
    protected void onDraw(Canvas canvas) {  
        super.onDraw(canvas);  
        if (!(mText == null || mText.isEmpty()))  
            canvas.drawText(mText, mCoordinateX, 30, getPaint());  
    }  
  
  
    @SuppressLint("HandlerLeak")  
    private Handler mHandler = new Handler() {  
        @Override  
        public void handleMessage(Message msg) {  
            switch (msg.what) {  
            case 0:  
                if (Math.abs(mCoordinateX) > (mTextWidth + 5)) {  
                    mCoordinateX = 0;  
                    invalidate();  
                    if (!mStopMarquee) {  
                        sendEmptyMessageDelayed(0,500);  
                    }  
                } else {  
                    mCoordinateX -= 1;  
                    invalidate();  
                    if (!mStopMarquee) {  
                        sendEmptyMessageDelayed(0, 30);  
                    }  
                }  
                break;  
            }  
            super.handleMessage(msg);  
        }  
    };  
}  

第二步：编写布局文件main.xml

第三步：编写SYIT_Index.java继承自Activity类

import java.io.IOException;  
import cn.superyouth.www.itools.MarqueeText;  
import android.annotation.SuppressLint;  
import android.app.Activity;  
import android.content.ComponentName;  
import android.content.Intent;  
import android.graphics.Color;  
import android.os.AsyncTask;  
import android.os.Bundle;  
import android.os.Handler;  
import android.os.Message;  
import android.text.method.ScrollingMovementMethod;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.AdapterView;  
import android.widget.GridView;  
import android.widget.TextView;  
import android.widget.Toast;  
import android.widget.AdapterView.OnItemClickListener;  
  
  
public class SYIT_Index extends Activity {  
    MarqueeText autoScrollTextView;  
  
  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
  
  
        autoScrollTextView = (MarqueeText) findViewById(R.id.textMsg);  
        autoScrollTextView.setTextSize(30);  
          
        autoScrollTextView.setTextColor(Color.BLUE);  
        autoScrollTextView.setText("暂无任何预警信息!");  
        // 点击预警提示信息  
        autoScrollTextView.setOnClickListener(new OnClickListener() {  
            public void onClick(View arg0) {  
                // 进入预警信息页面  
                Intent intent = new Intent(SYIT_Index.this, SYIT_Warning.class);  
                startActivity(intent);  
            }  
        });  
     }  
}  

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