android使用者介面-組件Widget-進度條ProgressBar

android的進度條有對話方塊進度條、標題進度條和水平進度條

一、對話方塊進度條

建立步驟

1、覆蓋Activity的onCreateDialog()方法，並在其中建立對話方塊。

2、調用Activity的showDialog()方法，顯示進度條對話方塊。

 

/Chapter04_UI_ProgressBar01/src/com/amaker/test/MainActivity.java

代碼

package com.amaker.test;

import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
private Button myBtn;
    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        myBtn = (Button)findViewById(R.id.Button01);
        myBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
                showDialog(0);
            }
        });
    }

    @Override
protected Dialog onCreateDialog(int id) {
        ProgressDialog dialog = new ProgressDialog(this);
// 可以不顯示標題
        dialog.setTitle("測試對話方塊");
        dialog.setIndeterminate(true);
        dialog.setMessage("程式正在載入請稍後！");
        dialog.setCancelable(true);

        dialog.setButton(Dialog.BUTTON_POSITIVE, "確定", 
new DialogInterface.OnClickListener() {
                    @Override
public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                }
        );

return dialog;
    }
}

 

二、標題列進度條

1、調用Activity的requestWindowFeatures()方法，獲得進度條。

2、調用Activity的setProgressBarIndeterminateVisibility()方法，顯示進度條對話方塊。

 

/Chapter04_UI_ProgressBar02/src/com/amaker/test/MainActivity.java

代碼

package com.amaker.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
/** Called when the activity is first created. */

private Button b1,b2;

    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

       requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
       setContentView(R.layout.main);
       b1 = (Button)findViewById(R.id.Button01);
       b2 = (Button)findViewById(R.id.Button02);

       b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
            setProgressBarIndeterminateVisibility(true);
        }
       });

       b2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
               setProgressBarIndeterminateVisibility(false);
           }
       });
    }
}

 

三、水平進度條

建立步驟

1、在布局檔案中聲明ProgressBar。

2、在Activity中獲得ProgressBar執行個體。

3、調用ProgressBar的incrementProgressBy()方法增加和減少進度。

 

/Chapter04_UI_ProgressBar03/src/com/amaker/test/MainActivity.java

代碼

package com.amaker.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends Activity {
private Button b1,b2;
    ProgressBar progressBar;
    @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        b1 = (Button)findViewById(R.id.Button01);
        b2 = (Button)findViewById(R.id.Button02);
        progressBar = (ProgressBar)findViewById(R.id.ProgressBar01);

        b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
                    progressBar.incrementProgressBy(1);
            }
        });

        b2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
                progressBar.incrementProgressBy(-1);
            }
        });

    }
}

 /Chapter04_UI_ProgressBar03/res/layout/main.xml

 

代碼

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
>
<ProgressBar 
android:id="@+id/ProgressBar01" 
    style="?android:attr/progressBarStyleHorizontal"
    android:layout_width="200dip"
    android:layout_height="wrap_content"
    android:max="100"
    android:progress="50"
></ProgressBar>

<Button 
android:id="@+id/Button01" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="增加"></Button>

<Button 
android:id="@+id/Button02" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="減少"></Button>

</LinearLayout>