android通过线程实现逐行显示信息

今天调查怎么实现在android 手机上逐行显示内容的效果。这是其中的一种方法，通过AlphaAnimation来和设置线程的延时做的，效果可以实现，但开销比较大。开销小的方法将在下一篇文章中介绍。

package com.display;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.Button;
import android.widget.TextView;

public class Display extends Activity {
private TextView[] tvs = new TextView[7];
private Handler handler = new Handler();
private Button btnReload;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

tvs[0] = (TextView) findViewById(R.id.TextView01);
tvs[1] = (TextView) findViewById(R.id.TextView02);
tvs[2] = (TextView) findViewById(R.id.TextView03);
tvs[3] = (TextView) findViewById(R.id.TextView04);
tvs[4] = (TextView) findViewById(R.id.TextView05);
tvs[5] = (TextView) findViewById(R.id.TextView06);
tvs[6] = (TextView) findViewById(R.id.TextView07);

loadContent();

btnReload = (Button) findViewById(R.id.Button01);
btnReload.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
loadContent();
}
});

}

private void loadContent() {
setInvisible();

for (int j = 0; j < tvs.length; j++) {
final TextView tv = tvs[j];
Runnable r = new Runnable() {

@Override
public void run() {
setAnimation(tv);
}

};

// 设置动画延时

handler.postDelayed(r, j * 1000);
}

}

// 设置动画

private void setAnimation(final TextView tv) {
AlphaAnimation aa = new AlphaAnimation(0, 1.0f);
aa.setDuration(1000);
aa.setAnimationListener(new AnimationListener() {

@Override
public void onAnimationEnd(Animation animation) {
tv.setVisibility(View.VISIBLE);

}

@Override
public void onAnimationRepeat(Animation animation) {

}

@Override
public void onAnimationStart(Animation animation) {

}

});
tv.startAnimation(aa);

}

private void setInvisible() {
for (int i = 0; i < tvs.length; i++) {
tvs[i].setVisibility(View.INVISIBLE);
}

}

}

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