Android学习笔记（一) 使用选择部件

ListActivity的使用

extend Activity

package com.example.listtest;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

    TextView selection;
    ListView list;

    String[] items={"t0","t1","t2","t3","t4"};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //setListAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,items));

        selection=(TextView)findViewById(R.id.textView1);
        list=(ListView)findViewById(R.id.listView1);
        //绑定数据
        list.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,items));

        list.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView< ?> arg0, View arg1, int position,long id){
                selection.setText(items[position]);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

extend ListActivity

spinner的使用

package com.example.test2;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends Activity {

    TextView text;
    Spinner sp;

    private String[] items={"t0","t1","t2","t3","t4"};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        text=(TextView)findViewById(R.id.textView1);
        sp=(Spinner)findViewById(R.id.spinner1);

        ArrayAdapter<String> aa=new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,items);
        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        sp.setAdapter(aa);

        sp.setOnItemSelectedListener(new OnItemSelectedListener() {
            public void onItemSelected(AdapterView< ?> parent, View v, int position, long id){
                text.setText(items[position]);
            }

            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub
                text.setText("Nothing selected!");
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

GridView的使用

package com.example.test3;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.TextView;

public class MainActivity extends Activity {

    TextView selection;
    GridView grid;

    String[] items={"t0","t1","t2","t3","t4","t5","t6","7t","t8","t9","t10","t11","t12","t13","t14","t15","t16","t17","t18","t19",};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        selection=(TextView)findViewById(R.id.textView1);
        grid=(GridView)findViewById(R.id.gridView1);

        grid.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,items));
        grid.setOnItemClickListener(new OnItemClickListener() {

            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                // TODO Auto-generated method stub
                selection.setText(items[arg2]);
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

 AutoCompleteTextView

package com.example.test5;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.TextView;
import android.support.v4.app.NavUtils;
import android.text.Editable;
import android.text.TextWatcher;

public class MainActivity extends Activity implements TextWatcher{

    TextView selection;
    AutoCompleteTextView edit;

    String[] items={"teacher","core","popular","wherese","compromise","teeth"};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        selection=(TextView)findViewById(R.id.textView1);
        edit=(AutoCompleteTextView)findViewById(R.id.autoCompleteTextView1);

        edit.addTextChangedListener(this);
        edit.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_dropdown_item_1line,items));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    public void afterTextChanged(Editable s) {
        // TODO Auto-generated method stub

    }

    public void beforeTextChanged(CharSequence s, int start, int count,
            int after) {
        // TODO Auto-generated method stub

    }

    public void onTextChanged(CharSequence s, int start, int before, int count) {
        // TODO Auto-generated method stub
        selection.setText(edit.getText());
    }

}

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