ProgressDialog进度

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[功能]
ProgressDialog 也是一种Dialog
一般在出现ProgressDialog 后台都会再开辟Thread 来做一些耗时的工作我演示的是从100数到0 这段时间既不太长不用浪费时间等待同时也能明显地看出效果

[代码]
1. ProgressDialog 使用

Java代码

public void startProgress(){
//to start Progress
pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,
false);
//pd.setIcon(R.drawable.icon);
}

public void startProgress(){        //to start Progress        pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,                        false);        //pd.setIcon(R.drawable.icon);    }

2. 开辟一个Thread来从100数到0 在数完后关闭ProgressDialog

Java代码

public class TaskLoop implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
loop(5000);
messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);
}
}
public void loop(long i){
long j = i;
while(j>0){
Log.d("tag",j+"");
j = j-1;
}
}

public class TaskLoop implements Runnable {                @Override                public void run() {                        // TODO Auto-generated method stub                        loop(5000);                                                messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);                }            }public void loop(long i){        long j = i;        while(j>0){                Log.d("tag",j+"");                                j = j-1;                }    }

3. 运行该Thread

Java代码

Thread loop = new Thread(new TaskLoop());
loop.start();

Thread loop = new Thread(new TaskLoop());loop.start();

4.定义一个Handler 用于接受关闭ProgressDialog 的通知

Java代码

private Handler messageListener = new Handler(){
public void handleMessage(Message msg) {
switch(msg.arg1){
case TASK_LOOP_COMPLETE:
pd.dismiss();
break;
}
}
};

private Handler messageListener = new Handler(){        public void handleMessage(Message msg) {                        switch(msg.arg1){                        case TASK_LOOP_COMPLETE:                                pd.dismiss();                                break;                                                        }                }    };

[所有代码]

Java代码

public class MyProgressUsage extends Activity {
public final static int TASK_LOOP_COMPLETE = 0;
ProgressDialog pd;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
findViewById(R.id.start).setOnClickListener(new OnClickListener(){
public void onClick(View v) {
// TODO Auto-generated method stub
startLoop();
}
});
}
public void startLoop(){
startProgress();
Thread loop = new Thread(new TaskLoop());
loop.start();
}
public class TaskLoop implements Runnable {
@Override
public void run() {
// TODO Auto-generated method stub
loop(5000);
messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);
}
}
public void startProgress(){
//to start Progress
pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,
false);
//pd.setIcon(R.drawable.icon);
}
//to do some time-cost task
public void loop(long i){
long j = i;
while(j>0){
Log.d("tag",j+"");
j = j-1;
}
}
private Handler messageListener = new Handler(){
public void handleMessage(Message msg) {
switch(msg.arg1){
case TASK_LOOP_COMPLETE:
pd.dismiss();
break;
}
}
};
}

public class MyProgressUsage extends Activity {        public final static int TASK_LOOP_COMPLETE = 0;                ProgressDialog pd;                TextView tv;            @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                findViewById(R.id.start).setOnClickListener(new OnClickListener(){                        public void onClick(View v) {                                // TODO Auto-generated method stub                                startLoop();                        }        });    }        public void startLoop(){                startProgress();                Thread loop = new Thread(new TaskLoop());        loop.start();    }            public class TaskLoop implements Runnable {                @Override                public void run() {                        // TODO Auto-generated method stub                        loop(5000);                                                messageListener.sendEmptyMessage(TASK_LOOP_COMPLETE);                }            }        public void startProgress(){        //to start Progress        pd = ProgressDialog.show(this, "loop from 100 to 0!", "is looping...", true,                        false);        //pd.setIcon(R.drawable.icon);    }        //to do some time-cost task    public void loop(long i){        long j = i;        while(j>0){                Log.d("tag",j+"");                                j = j-1;                }    }        private Handler messageListener = new Handler(){        public void handleMessage(Message msg) {                        switch(msg.arg1){                        case TASK_LOOP_COMPLETE:                                pd.dismiss();                                break;                                                        }                }    };    }

http://dl.iteye.com/upload/picture/pic/52676/11cd6622-cb13-337a-bd52-007185e972c0.png
over!