我在特定时间（2秒）替换了imageview中的多个图像.image保留在drawable文件夹中。应用程序在1.5。左右。
现在我想在显示秒时破坏以前的图像。因此可以轻松释放内存。
任何人帮助我？
感谢
尼克
更新::
package com.TouchSigns;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class tranning extends Activity {
/** Called when the activity is first created. */
CountDownTimer tns_DCounter;
Bitmap bm;
ImageButton tran_btn_skip;
TextView tran_banner;
Intent tranningIntent, tranningIntent2;
ImageView tran_imgwv_anim_image, tran_imgwv_playnow;
private MediaPlayer xmPlayer2, xmPlayer3, xmPlayer4, xmPlayer5, xmPlayer6,
xmPlayer7,xmPlayer8,xmPlayer9,xmPlayer10,xmPlayer11;
CountDownTimer aCounter, aCounter2, aCounter3, aCounter4, aCounter5,
aCounter6, aCounter7,aCounter8,aCounter9,aCounter10,aCounter11;
Boolean flag = false;
Typeface face;
TouchSigns shaneshAv = new TouchSigns();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.tranning);
{
try
{
tran_banner = (TextView) findViewById(R.id.tran_banner);
tran_btn_skip = (ImageButton) findViewById(R.id.tran_btn_skip);
tran_imgwv_playnow = (ImageView) findViewById(R.id.tran_imgwv_playnow);
tran_imgwv_anim_image = (ImageView) findViewById(R.id.tran_imgwv_anim_image);
xmPlayer2 = MediaPlayer.create(this, R.raw.bike_route);
xmPlayer3 = MediaPlayer.create(this, R.raw.closed);
xmPlayer4 = MediaPlayer.create(this, R.raw.exit);
xmPlayer5 = MediaPlayer.create(this, R.raw.no_parking);
xmPlayer6 = MediaPlayer.create(this, R.raw.one_way);
xmPlayer7 = MediaPlayer.create(this, R.raw.phone);
xmPlayer8 = MediaPlayer.create(this, R.raw.rail_road_crossing);
xmPlayer9 = MediaPlayer.create(this, R.raw.sale);
xmPlayer10 = MediaPlayer.create(this, R.raw.stop);
xmPlayer11 = MediaPlayer.create(this, R.raw.turn_off_tap);
tranningIntent = new Intent(this, touch_and_show.class);
animmation();
/*tran_btn_exit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
System.exit(0);
}
});*/
tran_btn_skip.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try
{
flag = true;
/*xmPlayer2.stop();
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();*/
startActivity(tranningIntent);
tranningIntent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
finish();
}catch (Exception e) {
}
}
});
System.out.println(flag);
face = Typeface.createFromAsset(this.getAssets(),
"fonts/comic.TTF");
}catch (Exception e) {
}
}
}
public void animmation() {
try
{
if(flag==true)
{
try
{
xmPlayer2.stop();
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}catch (Exception e) {
}
}
else
{
aCounter = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
xmPlayer2.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Route Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_bike_route);
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_bike_route);
tran_imgwv_anim_image.setImageBitmap(bm);
}
public void onFinish() {
if(flag==true)
{ try{
xmPlayer2.stop();
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter2 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer2.release();
xmPlayer3.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Closed Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_closed);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_closed);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
// TODO: handle exception
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter3 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer3.release();
xmPlayer4.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Exit Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_exit);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_exit);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
}
}
public void onFinish() {
if(flag==true)
{
try{
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter4 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer4.release();
xmPlayer5.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("No Parking Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_no_parking);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_no_parking);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter5 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer5.release();
xmPlayer6.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("One Way Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_oneway);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_oneway);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
// TODO: handle exception
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter6 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer6.release();
xmPlayer7.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Phone Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_phone);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_phone);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
// TODO: handle exception
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter7 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer7.release();
xmPlayer8.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Rail Crossing Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_rail_crossing);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_rail_crossing);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
// TODO: handle exception
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer2.stop();
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter8.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter8 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer8.release();
xmPlayer9.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Sale Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_sale);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_sale);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer2.stop();
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter9.cancel();
aCounter11.cancel();
}
catch (Exception e) {
// TODO: handle exception
}
}
else
{
aCounter9 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer9.release();
xmPlayer10.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Stop Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_stop);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_stop);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
// TODO: handle exception
}
}
public void onFinish() {
if(flag==true)
{
try
{
xmPlayer2.stop();
xmPlayer3.stop();
xmPlayer4.stop();
xmPlayer5.stop();
xmPlayer6.stop();
xmPlayer7.stop();
xmPlayer8.stop();
xmPlayer9.stop();
xmPlayer10.stop();
xmPlayer11.stop();
aCounter.cancel();
aCounter10.cancel();
aCounter2.cancel();
aCounter3.cancel();
aCounter4.cancel();
aCounter5.cancel();
aCounter6.cancel();
aCounter7.cancel();
aCounter8.cancel();
aCounter11.cancel();
}
catch (Exception e) {
}
}
else
{
aCounter10 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
try
{
xmPlayer10.release();
xmPlayer11.start();
tran_banner.setTypeface(face, Typeface.BOLD);
tran_banner.setText("Turn off Tap Sign");
//tran_imgwv_anim_image.setImageResource(R.drawable.sm_turn_off);
bm.recycle();
bm = BitmapFactory.decodeResource(getResources(),R.drawable.sm_turn_off);
tran_imgwv_anim_image.setImageBitmap(bm);
}catch (Exception e) {
}
}
public void onFinish() {
aCounter11 = new CountDownTimer(2000, 1000) {
public void onTick(long millisUntilFinished) {
invisibleControl();
}
public void onFinish() {
try {
/*xmPlayer2
.stop();
xmPlayer3
.stop();
xmPlayer4
.stop();
xmPlayer5
.stop();
xmPlayer6
.stop();
xmPlayer7
.stop();*/
aCounter.cancel();
aCounter2
.cancel();
aCounter3
.cancel();
aCounter4
.cancel();
aCounter5
.cancel();
aCounter6
.cancel();
startActivity(tranningIntent);
finish();
}catch (Exception e) {
}
}}; aCounter11.start();
}
}; aCounter10.start();
}//else
}
}; aCounter9.start();
}//else
}
}; aCounter8.start();
}//else
}
}; aCounter7.start();
}//else
}
}; aCounter6.start();
}//else
}
}; aCounter5.start();
}//else
}
}; aCounter4.start();
}//else
}
}; aCounter3.start();
}//else
}
};
aCounter2.start();
}//second else
}}; aCounter.start();
}
}catch (Exception e) {
}
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK)) {
try
{ flag=true;
stopService(new Intent(this, backServices.class));
finish();
}catch (Exception e) {
}
}
return super.onKeyDown(keyCode, event);
}
@Override
protected void onDestroy() {
super.onDestroy();
try
{
xmPlayer2.release();
xmPlayer3.release();
xmPlayer4.release();
xmPlayer5.release();
xmPlayer6.release();
xmPlayer7.release();
xmPlayer8.release();
xmPlayer9.release();
xmPlayer10.release();
xmPlayer11.release();
System.gc();
}catch (Exception e) {
}
}
private void invisibleControl() {
RelativeLayout r;
LinearLayout trans_linearll;
trans_linearll = (LinearLayout) findViewById(R.id.trans_linearll);
r = (RelativeLayout) findViewById(R.id.rela_tranning);
r.setBackgroundResource(R.drawable.playnow);
tran_btn_skip.setVisibility(View.INVISIBLE);
trans_linearll.setVisibility(View.INVISIBLE);
tran_banner.setVisibility(View.INVISIBLE);
tran_imgwv_anim_image.setVisibility(View.INVISIBLE);
/* tran_imgwv_playnow.setVisibility(View.VISIBLE);*/
}
}
答案 0 :(得分：5)
Java有垃圾收集器。不再使用对象时，对象将自动删除。你不需要做任何事情。
但是如果你想提高速度，请看看：
Bitmap.recycle()
http://developer.android.com/reference/android/graphics/Bitmap.html#recycle%28%29
Bitmap myBitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.myImage1);
imageView.setImageBitmap(myBitmap1);
/* ... */
Bitmap myBitmap2 = BitmapFactory.decodeResource(getResources(), R.drawable.myImage2);
imageView.setImageBitmap(myBitmap2);
myBitmap1.recycle(); // Don't need myBitmap1 anymore