Visibility1.java

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The file containing the source code shown below is located in the corresponding directory in <sdk>/samples/android-<version>/...

/*
 * Copyright (C) 2007 The Android开源工程
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.view;

// Need the following import to get access to the app resources, since this
// class is in a sub-package.
import com.example.android.apis.R;

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


/**
 * Demonstrates making a view VISIBLE, INVISIBLE and GONE
 *
 */
public class Visibility1 extends Activity {

    private View mVictim;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.visibility_1);

        // Find the view whose visibility will change
        mVictim = findViewById(R.id.victim);

        // Find our buttons
        Button visibleButton = (Button) findViewById(R.id.vis);
        Button invisibleButton = (Button) findViewById(R.id.invis);
        Button goneButton = (Button) findViewById(R.id.gone);

        // Wire each button to a click listener
        visibleButton.setOnClickListener(mVisibleListener);
        invisibleButton.setOnClickListener(mInvisibleListener);
        goneButton.setOnClickListener(mGoneListener);
    }

    OnClickListener mVisibleListener = new OnClickListener() {
        public void onClick(View v) {
            mVictim.setVisibility(View.VISIBLE);
        }
    };

    OnClickListener mInvisibleListener = new OnClickListener() {
        public void onClick(View v) {
            mVictim.setVisibility(View.INVISIBLE);
        }
    };

    OnClickListener mGoneListener = new OnClickListener() {
        public void onClick(View v) {
            mVictim.setVisibility(View.GONE);
        }
    };
}