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Android 常用元件

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Button 事件

方法一

Android 1.0

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mybutton = (Button) findViewById(R.id.button1);
mybutton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        myedit.setTextColor(Color.YELLOW);
    }
});

方法二

Android 1.0

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public class XXXXX ... implements View.OnClickListener{
...
    mybutton = (Button) findViewById(R.id.button1);
    mybutton.setOnClickListener(this);
}
public void onClick(View v){
    switch (v.getId()){
        case R.id.button1:
            myedit.setTextColor(Color.RED);
            break;
        default:
            break;
    }
}

方法三

Android 1.6
android:onClick="myClickHandler"

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public void myClickHandler(View v){
    switch (v.getId()){
        case R.id.button2:
            myedit.setTextColor(Color.BLACK);
            break;
        default:
            break;
    }
}

Image

Bitmap

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Bitmap icon = BitmapFactory.decodeResource(getResources(), R.drawable.koala);
myimagebutton.setImageBitmap(icon);

Resource

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myimagebutton.setImageResource(R.drawable.penguins);

CheckBox

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mycheckbox = (CheckBox) findViewById(R.id.checkBox);
mycheckbox.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        CheckBox t1 = (CheckBox) v;
//                if (((CheckBox) v).isChecked()){
        if (t1.isChecked()){
            mycheckbox.setText("Checked");
            Toast.makeText(MainActivity.this,"選",Toast.LENGTH_LONG).show();
        }else{
            mycheckbox.setText("Not Checked");
            Toast.makeText(MainActivity.this,"不選",Toast.LENGTH_LONG).show();
        }
    }
});
也可以直接if(mycheckbox.isChecked())

RadioButton

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mygroup = (RadioGroup) findViewById(R.id.myRadioGroup);
myradio = (RadioButton) findViewById(R.id.radioButton);
myradio2 = (RadioButton) findViewById(R.id.radioButton2);
mygroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup radioGroup, int i) {
        if (i == myradio.getId()){
            myedit.setText("AA Apple");
        } else if(i == myradio2.getId()){
            myedit.setText("BB Banana");
        }
    }
});

Spinner 下拉式

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private String[] myStringArray = { "Dog", "Cat", "Bird"};
private Spinner mysp;
...
mysp = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, myStringArray);
adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
mysp.setAdapter(adapter);
mysp.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        myedit.setText(myStringArray[i]);
    }
    @Override
    public void onNothingSelected(AdapterView<?> adapterView) {
        myedit.setText("QQ");
    }
});

NumberPicker

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private String[] nums = new String[21]; // 0~20
private NumberPicker mynp;
...
for(int i=0; i<nums.length;i++){
    nums[i] = Integer.toString(i*5);
}
mynp = (NumberPicker) findViewById(R.id.numberPicker);
mynp.setMaxValue(nums.length-1);
mynp.setMinValue(0);
mynp.setWrapSelectorWheel(false); //設置是否循環滾動
mynp.setDisplayedValues(nums);
...
Toast.makeText(getApplicationContext(), String.valueOf(mynp.getValue()), Toast.LENGTH_SHORT).show();

點擊空白關閉鍵盤

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RelativeLayout layout1 = (RelativeLayout) findViewById(R.id.layout1);
layout1.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        // 關閉鍵盤
        InputMethodManager imm = (InputMethodManager) getSystemService(INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(myedit.getWindowToken(),0);
    }
});