Android实现TextView文字水平滚动效果实现，androidtextview,第一步：编写Marque

Android实现TextView文字水平滚动效果实现，androidtextview,第一步：编写Marque

第一步：编写MarqueeText.java类，继承自TextView```javaimport 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```xml

第三步：编写SYIT_Index.java继承自Activity类```javaimport 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);          }      });   }

}
```