怎麼一打開app,就出現取消關注中,程序也無法退出,應該先出現關注中啊
package com.example.ch02_progressdialogdemo;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class ProgressDialogActivity extends Activity implements OnClickListener{
private Button button=null;
public ProgressDialog dialog=null;
int flag;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_progress_dialog);
button=(Button)findViewById(R.id.bt1);
button.setEnabled(true);
button.setText("加關注");
flag=0;
button.setOnClickListener(this);
dialog=ProgressDialog.show(ProgressDialogActivity.this,"","取消關注中...",true);
mHandler.sendEmptyMessageDelayed(0,3000);
}
Handler mHandler=new Handler()
{
public void handleMessage(Message msg)
{
super.handleMessage(msg);
button.setEnabled(false);
button.setText("加關注");
Toast.makeText(getBaseContext(), "取消關注成功", Toast.LENGTH_SHORT).show();
}
};
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.bt1:
if (flag==0)
{
dialog=ProgressDialog.show(ProgressDialogActivity.this,"","關注中...",true);
new Thread()
{
public void run()
{
try
{
sleep(3000);
}
catch(InterruptedException e)
{
e.printStackTrace();
}
finally
{
dialog.dismiss();
}
}
}.start();
button.setEnabled(false);
button.setText("已關注");
Toast.makeText(getBaseContext(), "關注成功", Toast.LENGTH_SHORT).show();
flag=1;
}
else if (flag==1)
{
dialog=ProgressDialog.show(ProgressDialogActivity.this,"","取消關注中...",true);
new Thread()
{
public void run()
{
try
{
sleep(3000);
}
catch(InterruptedException e)
{
e.printStackTrace();
}
finally
{
dialog.dismiss();
}
// mHandler.handleMessage("傳遞標志,實現Toast的顯示");
}
}.start();
button.setEnabled(false);
button.setText("加關注");
Toast.makeText(getBaseContext(), "取消關注成功", Toast.LENGTH_SHORT).show();
flag=0;
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.progress_dialog, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
還有怎麼不能這樣寫:
Handler mHandler=new Handler();
class Handle
{
public void handleMessage(Message msg)
{
super.handleMessage(msg);
button.setEnabled(false);
button.setText("加關注");
Toast.makeText(getBaseContext(), "取消關注成功", Toast.LENGTH_SHORT).show();
}
}
package com.example.prodialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private Button button;
public ProgressDialog dialog;
int flag, count;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button1);
button.setEnabled(true);
button.setText("加關注");
button.setBackgroundColor(Color.parseColor("#F5F5DC"));
flag = 0;
button.setOnClickListener(this);
}
public void run() {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
button.setEnabled(true);
button.setText("加關注");
button.setBackgroundColor(Color.parseColor("#F5F5DC"));
dialog.dismiss();
Toast.makeText(getBaseContext(), "取消關注成功", Toast.LENGTH_SHORT)
.show();
}
};
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
super.handleMessage(msg);
button.setEnabled(true);
button.setText("已關注");
button.setBackgroundColor(Color.parseColor("#F8F8FF"));
dialog.dismiss();
Toast.makeText(getBaseContext(), "關注成功", Toast.LENGTH_SHORT).show();
}
};
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button1:
if (flag == 0) {
dialog = ProgressDialog.show(MainActivity.this, "", "關注中...",
true);
count = 0;
new Thread() {
public void run() {
try {
while (count <= 10) {
dialog.setProgress(count++);
Thread.sleep(1000);
}
dialog.cancel();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
dialog.dismiss();
}
}
}.start();
handler.sendEmptyMessageDelayed(0, 1000);
flag = 1;
} else if (flag == 1) {
dialog = ProgressDialog.show(MainActivity.this, "", "取消關注中...",
true);
count = 0;
new Thread() {
public void run() {
try {
while (count <= 10) {
dialog.setProgress(count++);
Thread.sleep(1000);
}
dialog.cancel();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
dialog.dismiss();
}
}
}.start();
mHandler.sendEmptyMessageDelayed(0, 1000);
flag = 0;
}
}
}
}